#include <iostream>
using namespace std;
int main() {
    int a,b,c,d;
    while(cin>>a>>b){
        if(a==0&&b==0)return 0;
        int max_x=a,min_x=a,max_y=b,min_y=b;
        while(cin>>c>>d){
            if(c==0&&d==0)break;
            else{
                max_x = max(c,max_x);
                max_y = max(d,max_y);
                min_x = min(c,min_x);
                min_y = min(d,min_y);
            }
        }
        cout<<min_x<<" "<<min_y<<" "<<max_x<<" "<<max_y<<endl;
    }
}
// 64 位输出请用 printf("%lld")

用两个while判断输入,比较繁琐