/*
 * 513.cpp
 */

//include files
#include<bits/stdc++.h>
#include<utility>


using namespace std;

//DEFINE MACROS
#define MIN(a,b) (a>b?b:a)
#define MAX(a,b) (a>b?a:b)
#define PRINTLN(s) cout << s << endl

//DEFINE CONSTANT
#define MAX_LEN 100000

//DEFINE PROTOTYPE

int main(){
  int count = 0;
  pair <int ,int > start = make_pair(0,0);
  while(1){
	pair <int ,int > query = make_pair(0,0);;
	pair <int , int> minquery = make_pair(0,0);;
	int min;
	for (int i = 0; i < 4; ++i) {
	  if(count > 100 ){
		cout << "error" << "\n";
		return -1;		
	  }
	  int side = MAX_LEN/(count+1);
	  switch(i){
	  case 1:
		query = make_pair(start.first+side/2,start.first+side);
		break;
	  case 2:
		query = make_pair(side+start.first+side/2,start.first+side);
		break;
	  case 3:
		query = make_pair(start.first+side/2,side+start.first+side);
		break;
	  case 4:
		query = make_pair(side+start.first+side/2,side+start.first+side);
		break;	
	  }
	  cout << query.first << " "<< query.second << "\n";
	  int d;
	  cin >> d;
	  if(d ==0 ) return 0;
	  if(d<side){
		minquery = query;
		break;
	  }else{
		if(min > d){
		  min = d;
		  minquery = query;
		}
	  }
	  count++;
	}
	start = minquery;	
  }
  return 0;
}