package adv2019;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.List;
import java.util.PriorityQueue;

// 間違った実装
public class D16 {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	int[] anss;
	LST lst;
	int[] fnei;
	LST lstnei;
	PriorityQueue<long[]>  exit;
	int[] times, durs;
	int n;
	int K1, K2;
	
	void solve()
	{
		n = ni();
		K1 = ni()-1;
		K2 = ni()-1;
		int Q = ni();
		fnei = new int[n];
		lst = new LST(n);
		lst.setRange(n);
		lstnei = new LST(n);
		lstnei.setRange(n);
		exit = new PriorityQueue<>((x, y) -> {
			if(x[0] != y[0])return Long.compare(x[0], y[0]);
			return Long.compare(x[1], y[1]);
		});
		int waitingHead = 0;
		anss = new int[Q];
		times = new int[Q];
		durs = new int[Q];
		for(int z = 0;z < Q;z++){
			times[z] = ni();
			durs[z] = ni();
		}
		
//		if(!(Math.abs(K1-K2) == 1))throw new RuntimeException();
//		if(!(times[0] > 0))throw new RuntimeException();
//		for(int z = 0;z < Q-1;z++){
//			if(!(times[z] < times[z+1]))throw new RuntimeException();
//		}
//		for(int z = 0;z < Q-1;z++){
//			if(!(durs[z] > 0 && durs[z] <= 1000000000))throw new RuntimeException();
//		}
		
		for(int z = 0;z < Q;z++){
			while(!exit.isEmpty() && exit.peek()[0] <= times[z]){
				long thetime = exit.peek()[0];
				while(!exit.isEmpty() && exit.peek()[0] == thetime){
					remove(anss[(int)exit.poll()[1]]);
					while(waitingHead < z && search() != -1){
						sit(waitingHead++, thetime);
					}
				}
//				tr("thetime", thetime, lst, waitingHead);
			}
//			tr(z, search());
			if(waitingHead == z && search() != -1){
				sit(waitingHead++, times[z]);
			}
		}
		while(!exit.isEmpty()){
			long thetime = exit.peek()[0];
//			tr("thetime", thetime, lst, waitingHead);
			while(!exit.isEmpty() && exit.peek()[0] == thetime){
//				tr("rem", exit.peek());
				remove(anss[(int)exit.poll()[1]]);
				while(waitingHead < Q && search() != -1){
//					tr("sit", waitingHead);
					sit(waitingHead++, thetime);
				}
			}
		}
		assert waitingHead == Q;
		for(int v : anss){
			out.println(v+1);
		}
	}
	
	void sit(int x, long time)
	{
		int pos = search();
		assert pos != -1;
		lst.unset(pos);
		for(int i = Math.max(0, pos-1);i <= Math.min(n-1, pos+1);i++){
			fnei[i]++;
			lstnei.unset(i);
		}
		anss[x] = pos;
		exit.add(new long[]{time + durs[x], x});
	}
	
	void remove(int pos)
	{
		lst.set(pos);
		for(int i = Math.max(0, pos-1);i <= Math.min(n-1, pos+1);i++){
			if(--fnei[i] == 0){
				lstnei.set(i);
			}
		}
	}
	
	int search()
	{
		if(K1 < K2){
			int pre = lstnei.prev(K1);
			int nex = lstnei.next(K2);
			if(pre != -1 && nex != -1){
				if(K1-pre <= nex-K2){
					return pre;
				}else{
					return nex;
				}
			}else if(pre == -1 && nex != -1){
				return nex;
			}else if(nex == -1 && pre != -1){
				return pre;
			}
			pre = lst.prev(K1);
			nex = lst.next(K2);
			if(pre != -1 && nex != -1){
				if(K1-pre <= nex-K2){
					return pre;
				}else{
					return nex;
				}
			}else if(pre == -1 && nex != -1){
				return nex;
			}else if(nex == -1 && pre != -1){
				return pre;
			}
		}else{
			int pre = lstnei.prev(K2);
			int nex = lstnei.next(K1);
			if(pre != -1 && nex != -1){
				if(K2-pre < nex-K1){
					return pre;
				}else{
					return nex;
				}
			}else if(pre == -1 && nex != -1){
				return nex;
			}else if(nex == -1 && pre != -1){
				return pre;
			}
			pre = lst.prev(K2);
			nex = lst.next(K1);
			if(pre != -1 && nex != -1){
				if(K2-pre < nex-K1){
					return pre;
				}else{
					return nex;
				}
			}else if(pre == -1 && nex != -1){
				return nex;
			}else if(nex == -1 && pre != -1){
				return pre;
			}
		}
		return -1;
	}
	
	public static class SegmentTreeRMQ {
		public int M, H, N;
		public int[] st;
		
		public SegmentTreeRMQ(int n)
		{
			N = n;
			M = Integer.highestOneBit(Math.max(N-1, 1))<<2;
			H = M>>>1;
			st = new int[M];
			Arrays.fill(st, 0, M, Integer.MAX_VALUE);
		}
		
		public SegmentTreeRMQ(int[] a)
		{
			N = a.length;
			M = Integer.highestOneBit(Math.max(N-1, 1))<<2;
			H = M>>>1;
			st = new int[M];
			for(int i = 0;i < N;i++){
				st[H+i] = a[i];
			}
			Arrays.fill(st, H+N, M, Integer.MAX_VALUE);
			for(int i = H-1;i >= 1;i--)propagate(i);
		}
		
		public void update(int pos, int x)
		{
			st[H+pos] = x;
			for(int i = (H+pos)>>>1;i >= 1;i >>>= 1)propagate(i);
		}
		
		private void propagate(int i)
		{
			st[i] = Math.min(st[2*i], st[2*i+1]);
		}
		
		public int minx(int l, int r){
			int min = Integer.MAX_VALUE;
			if(l >= r)return min;
			while(l != 0){
				int f = l&-l;
				if(l+f > r)break;
				int v = st[(H+l)/f];
				if(v < min)min = v;
				l += f;
			}
			
			while(l < r){
				int f = r&-r;
				int v = st[(H+r)/f-1];
				if(v < min)min = v;
				r -= f;
			}
			return min;
		}
		
		public int min(int l, int r){ return l >= r ? 0 : min(l, r, 0, H, 1);}
		
		private int min(int l, int r, int cl, int cr, int cur)
		{
			if(l <= cl && cr <= r){
				return st[cur];
			}else{
				int mid = cl+cr>>>1;
				int ret = Integer.MAX_VALUE;
				if(cl < r && l < mid){
					ret = Math.min(ret, min(l, r, cl, mid, 2*cur));
				}
				if(mid < r && l < cr){
					ret = Math.min(ret, min(l, r, mid, cr, 2*cur+1));
				}
				return ret;
			}
		}
		
		public int firstle(int l, int v) {
			int cur = H+l;
			while(true){
				if(st[cur] <= v){
					if(cur < H){
						cur = 2*cur;
					}else{
						return cur-H;
					}
				}else{
					cur++;
					if((cur&cur-1) == 0)return -1;
					if((cur&1)==0)cur>>>=1;
				}
			}
		}
		
		public int lastle(int l, int v) {
			int cur = H+l;
			while(true){
				if(st[cur] <= v){
					if(cur < H){
						cur = 2*cur+1;
					}else{
						return cur-H;
					}
				}else{
					if((cur&cur-1) == 0)return -1;
					cur--;
					if((cur&1)==1)cur>>>=1;
				}
			}
		}
	}

	
	public static class LST {
		public long[][] set;
		public int n;
//		public int size;
		
		public LST(int n) {
			this.n = n;
			int d = 1;
			for(int m = n;m > 1;m>>>=6, d++);
			
			set = new long[d][];
			for(int i = 0, m = n>>>6;i < d;i++, m>>>=6){
				set[i] = new long[m+1];
			}
//			size = 0;
		}
		
		// [0,r)
		public LST setRange(int r)
		{
			for(int i = 0;i < set.length;i++, r=r+63>>>6){
				for(int j = 0;j < r>>>6;j++){
					set[i][j] = -1L;
				}
				if((r&63) != 0)set[i][r>>>6] |= (1L<<r)-1;
			}
			return this;
		}
		
		// [0,r)
		public LST unsetRange(int r)
		{
			if(r >= 0){
				for(int i = 0;i < set.length;i++, r=r+63>>>6){
					for(int j = 0;j < r+63>>>6;j++){
						set[i][j] = 0;
					}
					if((r&63) != 0)set[i][r>>>6] &= ~((1L<<r)-1);
				}
			}
			return this;
		}
		
		public LST set(int pos)
		{
			if(pos >= 0 && pos < n){
//				if(!get(pos))size++;
				for(int i = 0;i < set.length;i++, pos>>>=6){
					set[i][pos>>>6] |= 1L<<pos;
				}
			}
			return this;
		}
		
		public LST unset(int pos)
		{
			if(pos >= 0 && pos < n){
//				if(get(pos))size--;
				for(int i = 0;i < set.length && (i == 0 || set[i-1][pos] == 0L);i++, pos>>>=6){
					set[i][pos>>>6] &= ~(1L<<pos);
				}
			}
			return this;
		}
		
		public boolean get(int pos)
		{
			return pos >= 0 && pos < n && set[0][pos>>>6]<<~pos<0;
		}
		
		public LST toggle(int pos)
		{
			return get(pos) ? unset(pos) : set(pos);
		}
		
		public int prev(int pos)
		{
			for(int i = 0;i < set.length && pos >= 0;i++, pos>>>=6, pos--){
				int pre = prev(set[i][pos>>>6], pos&63);
				if(pre != -1){
					pos = pos>>>6<<6|pre;
					while(i > 0)pos = pos<<6|63-Long.numberOfLeadingZeros(set[--i][pos]);
					return pos;
				}
			}
			return -1;
		}
		
		public int next(int pos)
		{
			for(int i = 0;i < set.length && pos>>>6 < set[i].length;i++, pos>>>=6, pos++){
				int nex = next(set[i][pos>>>6], pos&63);
				if(nex != -1){
					pos = pos>>>6<<6|nex;
					while(i > 0)pos = pos<<6|Long.numberOfTrailingZeros(set[--i][pos]);
					return pos;
				}
			}
			return -1;
		}
		
		private static int prev(long set, int n)
		{
			long h = set<<~n;
			if(h == 0L)return -1;
			return -Long.numberOfLeadingZeros(h)+n;
		}
		
		private static int next(long set, int n)
		{
			long h = set>>>n;
			if(h == 0L)return -1;
			return Long.numberOfTrailingZeros(h)+n;
		}
		
		@Override
		public String toString()
		{
			List<Integer> list = new ArrayList<Integer>();
			for(int pos = next(0);pos != -1;pos = next(pos+1)){
				list.add(pos);
			}
			return list.toString();
		}
	}

	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//		Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
//			@Override
//			public void run() {
//				long s = System.currentTimeMillis();
//				solve();
//				out.flush();
//				if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//			}
//		};
//		t.start();
//		t.join();
	}
	
	public static void main(String[] args) throws Exception { new D16().run(); }
	
	private byte[] inbuf = new byte[1024];
	public int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private long[] nal(int n)
	{
		long[] a = new long[n];
		for(int i = 0;i < n;i++)a[i] = nl();
		return a;
	}
	
	private char[][] nm(int n, int m) {
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[][] nmi(int n, int m) {
		int[][] map = new int[n][];
		for(int i = 0;i < n;i++)map[i] = na(m);
		return map;
	}
	
	private int ni() { return (int)nl(); }
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}