#include <bits/stdc++.h>
using namespace std;

int ask( int x, int y ) {
  cout << x << " " << y << endl;
  int d;
  cin >> d;
  if( d == 0 ) {
    exit( 0 );
  }
  return d;
}

signed main() {
  ios::sync_with_stdio( 0 );
  int a = ask( 0, 0 );
  int b = ask( 0, a );
  ask( b / 2, a - b / 2 );
  return 0;
}