//#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
#define rep(i, n) for(int i=0; i<n; ++i)
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
using namespace std;
using ll = int64_t;
using ld = long double;
using P = pair<int, int>;
using vs = vector<string>;
using vi = vector<int>;
using vvi = vector<vi>;
template<class T> using PQ = priority_queue<T>;
template<class T> using PQG = priority_queue<T, vector<T>, greater<T> >;
const int INF = 100010001;
const ll LINF = (ll)INF*INF*10;
template<typename T1, typename T2>
inline bool chmax(T1 &a, T2 b) {return a < b && (a = b, true);}
template<typename T1, typename T2>
inline bool chmin(T1 &a, T2 b) {return a > b && (a = b, true);}
template<typename T1, typename T2>
istream &operator>>(istream &is, pair<T1, T2> &p) { return is >> p.first >> p.second;}
template<typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p) { return os << p.first << ' ' << p.second;}

int me, kiri;
const int X = 97;

//head

inline int num(int i, int j) {return i*10+j;}
map<int, int> mp;
map<int, int> mp_;
inline bool judge() {
  if(me == kiri) return true;
  else return false;
}
inline int U(int i) {
  return (i+i/10)&1;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int u = 1;
  rep(i, 10) {
    rep(j, 10) mp[u<<j] = num(i, j);
    u *= 5;
  }
  for(P x:mp) {
    mp_[x.second] = x.first;
  }
  cin >> me >> kiri;
  me = mp[me];
  kiri = mp[kiri];
  if((U(me)^U(kiri))&1) goto ODD;
EVEN:;
    while(me != X) {
      if(me/10 != 9) {
        me += 10;
      } else {
        if(me > X) {
          me--;
        } else {
          me++;
        }
      }
      cout << mp_[me] << endl;
      if(judge()) return 0;
      cin >> kiri;
      kiri = mp[kiri];
      if(judge()) return 0;
      if((U(me)^U(kiri))&1) goto ODD;
    }
    me += 2;
    cout << int(1e9) << endl;
    if(judge()) return 0;
    cin >> kiri;
    kiri = mp[kiri];
    if(judge()) return 0;
ODD:;
    while(true) {
      int i = abs(kiri-me)/10;
      int j = abs(kiri-me)%10;
      if(i > j) {
        if(kiri > me) {
          me += 10;
        } else {
          me -= 10;
        }
      } else {
        if(kiri%10 > me%10) {
          me++;
        } else {
          me--;
        }
      }
      cout << mp_[me] << endl;
      if(judge()) return 0;
      cin >> kiri;
      kiri = mp[kiri];
      if(judge()) return 0;
      if(~(U(me)^U(kiri))&1) goto EVEN;
    }
}