#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;

#define ll         long long
#define PI         acos(-1.0)
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)

int main(){
    int X = 50000, Y = 50000;
    int l = 0, r = 100000;
    int ld, rd, dd, cen;
    cout << l << Y << endl;
    cin >> ld;
    cout << r << Y << endl;
    cin >> rd;
    FOR(i,0,90){
        if(ld > rd){
            l = (l + r) / 2;
            cout << l << Y << endl;
            cin >> ld;
        }
        else if(ld < rd){
            r = (l + r) / 2;
            cout << r << Y << endl;
            cin >> ld;
        }
        if(ld == rd){
            cen = (l + r) / 2;
            cout << cen << Y << endl;
            cin >> dd;
            if(dd==0) return 0;
            break;
        }
    }
    int d;
    cout << cen << Y+dd << endl;
    cin >> d;
    if(d == 0) return 0;
    cout << cen << Y-dd << endl;
    cin >> d;
    if(d == 0) return 0;
}