#include <bits/stdc++.h>

using namespace std;
typedef int64_t var;

int main() {

    double a, b;
    cout<<"0 0\n";
    cout.flush();
    while(true) {
        cin>>a>>b;
        cout<<-a<<" "<<-b<<'\n';
        cout.flush();
    }

    return 0;
}