shoko222

#include <iostream>
#include <cstring>
using namespace std;
int main(){
    int x[41],y[41],c;
    for(int i=1; i<=40; i++){
        cin>>x[i]>>y[i];
        if(x[i] == 0 && y[i] == 0)
            i = 41;
    }
    for(int i=1; i<=40; i++){
        if(x[i] != 0 && y[i] != 0)
            cout<<x[i]<<" "<<y[i]<<endl;
        else i = 41;
    }
    return 0;
}