//範囲外の確認
#include <iostream>
#include <algorithm>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;

int main(){
  while(1){
    cout << 0 << endl;
    cout.flush();
    int ret;
    cin >> ret;
    if(ret == 0) continue;
    else break;
  }
  return 0;
}