#include <iostream>
using namespace std;
int main(){
    string S[2];
    int P[2];
    char X[2];
    for(int i=0;i<2;i++){
        cin >> S[i] >> P[i] >> X[i];
    }
    if(P[0]>P[1])cout << S[0] << endl;
    else if(P[0]<P[1])cout << S[1] << endl;
    else cout << "-1" << endl;

    return 0;
}