oioioiS2S2S2

#include <iostream>
#include <map>

using namespace std;

int main(){

    int c, j, x, y;
    map<int, int>::iterator it;
    map<int, int> total;

    scanf("%d %d", &c, &j);

    for(int i = 0; i < c; i++){
        scanf("%d %d", &x, &y);
        total.insert(make_pair(x, y));
    }

    for(int i = 0; i < j; i++){
        scanf("%d %d", &x, &y);

        if (total.find(x) != total.end()){

            if(y > total[x]){
                printf("%d %d\n", x, y);
            }
        }
    }

    return 0;
}