import static java.lang.Math.*;
import static java.util.Arrays.*;

import java.io.*;
import java.lang.reflect.*;
import java.util.*;
import java.util.ArrayList;
import java.util.concurrent.*;
import java.util.function.*;

public final class Main{
  public static void main(String[] args) throws Exception{
    MyReader in = new MyReader(System.in);
    MyWriter out = new MyWriter(System.out,false),log = new MyWriter(System.err,true);
    int T = Solver.multi ? in.it() : 1;
    while (T-- > 0)
      Optional.ofNullable(new Solver(in,out,log).solve()).ifPresent(out::println);
    out.flush();
  }
}

class Solver extends BaseSolver{
  public Solver(MyReader in,MyWriter out,MyWriter log){ super(in,out,log); }

  public static boolean multi = false;
  int[][] map = {{0, 0}, {0, 0}};

  public Object solve(){

    //    for (int X = 0;X < 2;X++)
    //      for (int Y = 0;Y < 2;Y++)
    //        for (int p00 = 0;p00 < 2;p00++)
    //          for (int p01 = 0;p01 < 2;p01++)
    //            for (int p10 = 0;p10 < 2;p10++)
    //              for (int p11 = 0;p11 < 2;p11++) {
    //                map[0][0] = p00;
    //                map[0][1] = p01;
    //                map[1][0] = p10;
    //                map[1][1] = p11;
    //                if (X == Y && op(X,Y) != op(X,Y,X,Y)) {
    //                  log.printlns(X,Y);
    //                  log.println(map);
    //                  log.println("");
    //                }
    //                if (X == 0 && Y == 1 && op(X,Y) != (op(X,Y,0,1) ^1)) {
    //                  log.printlns(X,Y);
    //                  log.println(map);
    //                  log.println("");
    //                }
    //                if (X == 1 && Y == 0 && op(X,Y) != op(X,Y,X ^1,Y ^1)) {
    //                  log.printlns(X,Y);
    //                  log.println(map);
    //                  log.println("");
    //                }
    //              }

    int X = in.it(),Y = in.it();
    if (X == Y) {
      out.println(4);
      out.printlns(X,Y,X,Y);
      out.flush();
      int x = in.it();
      return x;
    }

    out.println(4);
    out.printlns(X,Y,X,Y);
    out.flush();

    return rd.nextInt(2);
  }

  private int op(int... arr){

    int ret = map[arr[0]][arr[1]];

    for (int i = 2;i < arr.length;i++)
      ret = map[ret][arr[i]];

    return ret;
  }

  public int lis(int[] arr){
    int[] lis = new int[arr.length];
    fill(lis,infI);
    for (var a:arr) {
      int i = bSearchI(0,arr.length,ii -> lis[ii] < a) +1;
      lis[i] = a;
    }

    return bSearchI(0,arr.length,i -> lis[i] < infI) +1;
  }

  long[] extend_gcd(long a,long b,long x,long y){
    if (b == 0)
      return new long[]{1, 0, a};
    else {
      long[] d = extend_gcd(b,a %b,y,x);
      d[0] ^= d[1];
      d[1] ^= d[0];
      d[0] ^= d[1];
      d[1] -= a /b *d[0];
      return d;
    }
  }
}

class Data extends BaseV{}

class Permutation{
  private int n;
  int[] arr;

  public Permutation(int n){ arr = Util.arrI(this.n = n,i -> i); }

  public Permutation(int[] arr){ this.arr = copyOf(arr,n = arr.length); }

  public boolean increment(){ return crement(1); }

  public boolean decrement(){ return crement(-1); }

  private boolean crement(int d){
    int l = n -2;
    while (0 <= l && arr[l] *d >= arr[l +1] *d)
      l--;

    if (l < 0)
      return false;

    int r = n -1;
    while (arr[l] *d >= arr[r] *d)
      r--;
    swap(l,r);

    l++;
    r = n -1;
    while (l < r)
      swap(l++,r--);

    return true;
  }

  private void swap(int l,int r){
    arr[l] ^= arr[r];
    arr[r] ^= arr[l];
    arr[l] ^= arr[r];
  }
}

class LowLink extends Graph<Long>{
  private int[] low;
  private int[] ord;
  private int[] inc;

  public LowLink(int n){ super(n,false); }

  public void build(){
    @SuppressWarnings("unchecked")
    Iterator<Edge<Long>>[] iterator = new Iterator[n];
    for (int v = 0;v < n;v++)
      iterator[v] = go(v).iterator();
    low = new int[n];
    ord = new int[n];
    fill(ord,-1);
    inc = new int[n];
    int[] stack = new int[n +2];
    stack[0] = -1;
    int len = 0;
    int count = 0;
    for (int root = 0;root < n;root++) {
      if (ord[root] != -1)
        continue;
      ord[root] = low[root] = count++;
      inc[root]--;
      stack[len = 1] = root;
      while (0 < len) {
        int v = stack[len];
        int p = stack[len -1];
        if (iterator[v].hasNext()) {
          int w = iterator[v].next().v;
          if (ord[w] == -1) {
            ord[w] = low[w] = count++;
            stack[++len] = w;
          } else if (w != p && low[v] > ord[w])
            low[v] = ord[w];
        } else {
          len--;
          if (p != -1) {
            if (low[p] > low[v])
              low[p] = low[v];
            if (ord[p] <= low[v])
              inc[p]++;
          }
        }
      }
    }
  }

  public boolean isBridge(int x,int y){ return ord[x] < low[y] || ord[y] < low[x]; }

  public boolean isArticulation(int x){ return inc[x] > 0; }

  public int articulationValue(int x){ return inc[x]; }
}

class Edge<L> {
  public int id,u,v;
  public L val;
  public Edge<L> re;

  public Edge(int id,int u,int v,L val){
    this.id = id;
    this.u = u;
    this.v = v;
    this.val = val;
  }
}

class Graph<L> {
  public int n;
  public MyList<Edge<L>> es;
  private MyList<Edge<L>>[] go,bk;

  public Graph(int n,boolean dir){
    this.n = n;
    go = Util.cast(new MyList[n]);
    bk = dir ? Util.cast(new MyList[n]) : go;
    for (int i = 0;i < n;i++) {
      go[i] = new MyList<>();
      bk[i] = new MyList<>();
    }
    es = new MyList<>();
  }

  protected L inv(L l){ return l; }

  public void addEdge(int u,int v){ addEdge(u,v,null); }

  public void addEdge(int u,int v,L l){
    var e = new Edge<>(es.size(),u,v,l);
    var re = new Edge<>(e.id,e.v,e.u,inv(e.val));
    es.add(e);
    go[u].add(re.re = e);
    bk[v].add(e.re = re);
  }

  public MyList<Edge<L>> go(int u){ return go[u]; }

  public MyList<Edge<L>> bk(int u){ return bk[u]; }
}

class UnionFind{
  int num;
  protected int[] dat;
  protected int[] nxt;

  public UnionFind(int n){
    dat = new int[n];
    nxt = new int[n];
    setAll(nxt,i -> i);
    fill(dat,-1);
    num = n;
  }

  public int root(int x){ return dat[x] < 0 ? x : (dat[x] = root(dat[x])); }

  public boolean same(int u,int v){ return root(u) == root(v); }

  public boolean unite(int u,int v){
    if ((u = root(u)) == (v = root(v)))
      return false;

    if (dat[u] > dat[v]) {
      u ^= v;
      v ^= u;
      u ^= v;
    }
    dat[u] += dat[v];
    dat[v] = u;
    num--;
    nxt[u] ^= nxt[v];
    nxt[v] ^= nxt[u];
    nxt[u] ^= nxt[v];
    return true;
  }

  public int size(int x){ return -dat[root(x)]; }

  public int[] getGroup(int x){
    int[] ret = new int[size(x)];
    for (int i = 0,c = root(x);i < ret.length;i++)
      ret[i] = c = nxt[c];
    return ret;
  }
}

class AVLTree{
  private Node root;

  public void add(long v){ add(v,1); }

  public void add(long v,int k){ root = root == null ? new Node(v,k) : add(root,v,k); }

  private Node add(Node nd,long v,int k){
    if (nd.lft == null) {
      int c = Long.compare(nd.val,v);
      if (c == 0) {
        nd.sz += k;
        return nd;
      } else {
        var ret = new Node(0,0);
        ret.cld(-c,new Node(v,k));
        ret.cld(c,nd);
        nd = ret;
      }
    } else {
      int c = Long.compare(v,nd.rht.l);
      nd.lft = c < 0 ? add(nd.lft,v,k) : nd.lft;
      nd.rht = c < 0 ? nd.rht : add(nd.rht,v,k);
    }
    return balance(nd);
  }

  public void del(long v){ del(v,1); }

  public void del(long v,int k){ root = del(root,v,k); }

  private Node del(Node nd,long v,int k){
    if (nd.lft == null) {
      int c = Long.compare(nd.val,v);
      if (c == 0)
        nd.sz -= k;
      return c != 0 || 0 < nd.sz ? nd : null;
    }
    int c = Long.compare(v,nd.rht.l) *2 +1;
    Node del = del(c < 0 ? nd.lft : nd.rht,v,k);
    if (del == null)
      return nd.cld(-c);
    nd.cld(c,del);
    return balance(nd);
  }

  public long get(int i){ return get(root,i); }

  private long get(Node nd,int i){
    return nd.lft == null ? nd.val : i < nd.lft.sz ? get(nd.lft,i) : get(nd.rht,i -nd.lft.sz);
  }

  public long get(int l,int r){ return root == null ? 0 : get(root,l,min(r,size())); }

  private long get(Node nd,int l,int r){
    if (0 == l && r == nd.sz)
      return nd.val();
    else if (nd.lft == null)
      return nd.val *(r -l);
    else {
      long ret = 0;
      if (l < nd.lft.sz)
        ret += get(nd.lft,l,min(nd.lft.sz,r));
      if (nd.lft.sz < r)
        ret += get(nd.rht,max(0,l -nd.lft.sz),r -nd.lft.sz);
      return ret;
    }
  }

  public long getUnder(long v){ return root == null || v < root.l ? 0 : getUnder(root,v); }

  private long getUnder(Node nd,long v){
    if (nd.lft == null)
      return v <= nd.val ? 0 : nd.val();
    return v < nd.rht.l ? getUnder(nd.lft,v) : nd.lft.val() +getUnder(nd.rht,v);
  }

  public int idx(long v){ return root == null || v < root.l ? 0 : idx(root,v); }

  private int idx(Node nd,long v){
    if (nd.lft == null)
      return v <= nd.val ? 0 : nd.sz;
    return v < nd.rht.l ? idx(nd.lft,v) : nd.lft.sz +idx(nd.rht,v);
  }

  public int size(){ return root == null ? 0 : root.sz; }

  private Node balance(Node nd){ return (1 < abs(nd.bis = nd.rht.rnk -nd.lft.rnk) ? (nd = rotate(nd)) : nd).update(); }

  private Node rotate(Node u){
    var v = u.cld(u.bis);
    if (u.bis *v.bis < -1)
      v = rotate(v);
    u.cld(u.bis,v.cld(-u.bis));
    v.cld(-u.bis,u);
    u.update();
    return v;
  }

  private class Node{
    private int sz,bis,rnk;
    private long val,l;
    private Node lft,rht;

    private Node(long val,int sz){
      this.sz = sz;
      this.val = l = val;
    }

    private Node update(){
      sz = lft.sz +rht.sz;
      bis = rht.rnk -lft.rnk;
      rnk = max(lft.rnk,rht.rnk) +1;
      val = lft.val() +rht.val();
      l = lft.l;
      return this;
    }

    private Node cld(int c){ return c < 0 ? lft : rht; }

    private void cld(int c,Node nd){ nd = c < 0 ? (lft = nd) : (rht = nd); }

    private long val(){ return lft == null && 1 < sz ? val *sz : val; }
  }

  @Override
  public String toString(){
    List<Long> list = new ArrayList<>();
    for (int i = 0;i < size();i++)
      list.add(get(i));
    return Arrays.toString(list.stream().mapToLong(z -> z).toArray());
  }
}

abstract class BaseV{
  public int sz;
  public boolean fail;
}

class MyStack<T> extends MyList<T>{
  public T pop(){ return remove(size() -1); }

  public T peek(){ return get(size() -1); }
}

class MyList<T> implements Iterable<T>{
  private T[] arr;
  private int sz;

  public MyList(){ this(16); }

  public MyList(int n){ arr = Util.cast(new Object[max(16,n)]); }

  public MyList(MyList<T> org){
    this(org.sz);
    System.arraycopy(org.arr,0,arr,0,sz = org.sz);
  }

  public boolean isEmpty(){ return sz == 0; }

  public int size(){ return sz; }

  public T get(int i){ return arr[i]; }

  public void add(T t){ (arr = sz < arr.length ? arr : copyOf(arr,sz *5 >>2))[sz++] = t; }

  public T remove(int i){
    var ret = arr[i];
    sz--;
    for (int j = i;j < sz;j++)
      arr[j] = arr[j +1];
    return ret;
  }

  public T removeFast(int i){
    var ret = arr[i];
    arr[i] = arr[--sz];
    return ret;
  }

  public void sort(){ sort(Util.cast(Comparator.naturalOrder())); }

  public void sort(Comparator<T> cmp){ Arrays.sort(arr,0,sz,cmp); }

  public <U> MyList<U> map(Function<T, U> func){
    MyList<U> ret = new MyList<>(sz);
    forEach(t -> ret.add(func.apply(t)));
    return ret;
  }

  public MyList<T> rev(){
    MyList<T> ret = new MyList<>(sz);
    for (int i = sz;i-- > 0;)
      ret.add(get(i));
    return ret;
  }

  public T[] toArray(){ return copyOf(arr,sz); }

  public void swap(int i,int j){
    var t = arr[i];
    arr[i] = arr[j];
    arr[j] = t;
  }

  public void set(int i,T t){ arr[i] = t; }

  public void clear(){ sz = 0; }

  @Override
  public Iterator<T> iterator(){
    return new Iterator<>(){
      int i = 0;

      @Override
      public boolean hasNext(){ return i < sz; }

      @Override
      public T next(){ return arr[i++]; }
    };
  }
}

class BaseSolver extends Util{
  public MyReader in;
  public MyWriter out,log;

  public BaseSolver(MyReader in,MyWriter out,MyWriter log){
    this.in = in;
    this.out = out;
    this.log = log;
  }

  protected int[][] addId(int[][] T){
    return arr(new int[T.length][],i -> {
      int[] t = copyOf(T[i],T[i].length +1);
      t[t.length -1] = i;
      return t;
    });
  }

  protected long inv(long x){ return pow(x,mod -2); }

  protected long pow(long x,long n){ return pow(x,n,Util.mod); }

  protected long pow(long x,long n,long mod){
    long ret = 1;
    for (x %= mod;0 < n;x = x *x %mod,n >>= 1)
      if ((n &1) == 1)
        ret = ret *x %mod;
    return ret;
  }

  protected int bSearchI(int o,int n,IntPredicate judge){
    if (!judge.test(o))
      return o -Integer.signum(n -o);
    for (int m = 0;1 < abs(n -o);)
      m = judge.test(m = o +n >>1) ? (o = m) : (n = m);
    return o;
  }

  protected long bSearchL(long o,long n,LongPredicate judge){
    for (long m = 0;1 < abs(n -o);)
      m = judge.test(m = o +n >>1) ? (o = m) : (n = m);
    return o;
  }

  protected double bSearchD(double o,double n,DoublePredicate judge){
    for (double m,c = 0;c < 100;c++)
      m = judge.test(m = (o +n) /2) ? (o = m) : (n = m);
    return o;
  }

  protected long gcd(long a,long b){
    while (0 < b) {
      long t = a;
      a = b;
      b = t %b;
    }
    return a;
  }

  public long lcm(long a,long b){ return b /gcd(a,b) *a; }

  protected long ceil(long a,long b){ return (a +b -1) /b; }
}

class Util{
  public static String yes = "Yes",no = "No";
  public static int infI = (1 <<30) -1;
  public static long infL = (1L <<61 |1 <<30) -1,
      mod = 998244353;
  public static Random rd = ThreadLocalRandom.current();
  private long st = System.currentTimeMillis();

  protected long elapsed(){ return System.currentTimeMillis() -st; }

  protected void reset(){ st = System.currentTimeMillis(); }

  public static int[] arrI(int N,IntUnaryOperator f){
    int[] ret = new int[N];
    setAll(ret,f);
    return ret;
  }

  public static long[] arrL(int N,IntToLongFunction f){
    long[] ret = new long[N];
    setAll(ret,f);
    return ret;
  }

  public static double[] arrD(int N,IntToDoubleFunction f){
    double[] ret = new double[N];
    setAll(ret,f);
    return ret;
  }

  public static <T> T[] arr(T[] arr,IntFunction<T> f){
    setAll(arr,f);
    return arr;
  }

  @SuppressWarnings("unchecked")
  public static <T> T cast(Object obj){ return (T) obj; }
}

class MyReader{
  private byte[] buf = new byte[1 <<16];
  private int ptr,tail;
  private InputStream in;

  public MyReader(InputStream in){ this.in = in; }

  private byte read(){
    if (ptr == tail)
      try {
        tail = in.read(buf);
        ptr = 0;
      } catch (IOException e) {}
    return buf[ptr++];
  }

  private boolean isPrintable(byte c){ return 32 < c && c < 127; }

  private byte nextPrintable(){
    byte ret = read();
    while (!isPrintable(ret))
      ret = read();
    return ret;
  }

  public int it(){ return toIntExact(lg()); }

  public int[] it(int N){ return Util.arrI(N,i -> it()); }

  public int[][] it(int H,int W){ return Util.arr(new int[H][],i -> it(W)); }

  public int idx(){ return it() -1; }

  public int[] idx(int N){ return Util.arrI(N,i -> idx()); }

  public int[][] idx(int H,int W){ return Util.arr(new int[H][],i -> idx(W)); }

  public long lg(){
    byte i = nextPrintable();
    boolean negative = i == 45;
    long n = negative ? 0 : i -'0';
    while (isPrintable(i = read()))
      n = 10 *n +i -'0';
    return negative ? -n : n;
  }

  public long[] lg(int N){ return Util.arrL(N,i -> lg()); }

  public long[][] lg(int H,int W){ return Util.arr(new long[H][],i -> lg(W)); }

  public double dbl(){ return Double.parseDouble(str()); }

  public double[] dbl(int N){ return Util.arrD(N,i -> dbl()); }

  public double[][] dbl(int H,int W){ return Util.arr(new double[H][],i -> dbl(W)); }

  public char[] ch(){ return str().toCharArray(); }

  public char[][] ch(int H){ return Util.arr(new char[H][],i -> ch()); }

  public String line(){
    StringBuilder sb = new StringBuilder();
    for (byte c;(c = read()) != '\n';)
      sb.append((char) c);
    return sb.toString();
  }

  public String str(){
    StringBuilder sb = new StringBuilder();
    sb.append((char) nextPrintable());
    for (byte c;isPrintable(c = read());)
      sb.append((char) c);
    return sb.toString();
  }

  public String[] str(int N){ return Util.arr(new String[N],i -> str()); }

  public String[][] str(int H,int W){ return Util.arr(new String[H][],i -> str(W)); }
}

class MyWriter{
  private OutputStream out;
  private byte[] buf = new byte[1 <<16],ibuf = new byte[20];
  private int tail;
  private boolean autoflush;

  public MyWriter(OutputStream out,boolean autoflush){
    this.out = out;
    this.autoflush = autoflush;
  }

  public void flush(){
    try {
      out.write(buf,0,tail);
      tail = 0;
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

  private void ln(){
    write((byte) '\n');
    if (autoflush)
      flush();
  }

  private void write(byte b){
    buf[tail++] = b;
    if (tail == buf.length)
      flush();
  }

  private void write(long n){
    if (n < 0) {
      n = -n;
      write((byte) '-');
    }
    int i = ibuf.length;
    do {
      ibuf[--i] = (byte) (n %10 +'0');
      n /= 10;
    } while (n > 0);
    while (i < ibuf.length)
      write(ibuf[i++]);
  }

  private void print(Object obj){
    if (obj instanceof Boolean)
      print((boolean) obj ? Util.yes : Util.no);
    else if (obj instanceof Integer)
      write((int) obj);
    else if (obj instanceof Long)
      write((long) obj);
    else if (obj instanceof char[])
      for (char b:(char[]) obj)
        write((byte) b);
    else if (obj.getClass().isArray()) {
      int l = Array.getLength(obj);
      for (int i = 0;i < l;i++) {
        print(Array.get(obj,i));
        if (i +1 < l)
          write((byte) ' ');
      }
    } else
      print(Objects.toString(obj).toCharArray());
  }

  public void println(Object obj){
    if (obj == null)
      obj = "null";
    if (obj instanceof Iterable<?>)
      for (Object e:(Iterable<?>) obj)
        println(e);
    else if (obj.getClass().isArray() && Array.getLength(obj) > 0 && Array.get(obj,0).getClass().isArray()) {
      int l = Array.getLength(obj);
      for (int i = 0;i < l;i++)
        println(Array.get(obj,i));
    } else {
      print(obj);
      ln();
    }
  }

  public void printlns(Object... o){
    print(o);
    ln();
  }
}