#include<stdio.h>

unsigned int ask(unsigned int x,unsigned int y){
  printf("%u %u\n",x,y);
  fflush(stdout);
  unsigned int d=0;
  char c;
  while((c=getchar())!=EOF){
    d=10*d+c-'0';
  }
  return d;
}

void run(void){
  unsigned int d=ask(0,0);
  if(d==0) return;

  unsigned int e=ask(0,d);
  if(e==0) return;

  unsigned int a=d-e/2;
  unsigned int b=e/2;
  if(a>0){
    ask(a,b);
  } else {
    ask(e,0);
  }

  return;
}

int main(void){
  run();
  return 0;
}