#include <iostream>
#include <vector>
using namespace std;

int main()
{
int number=1;
int x=0,y=0;
int nr=0;
for(x=0;x<200 && number;x++)
    for(y=0;y<=x && number;y++)
{
    cout<<x<<" "<<y;
    cout.flush();
    cin>>number;
}
}