#include<bits/stdc++.h>
using namespace std;

int main(){
    string sa,sb,xa,xb;
    long pa,pb; cin >> sa >> pa >> xa >> sb >> pb >> xb;
    if(pa == pb){
        cout << "-1" << endl;
    }else if(pa > pb){
        cout << sa << endl;
    }else{
        cout << sb << endl;
    }
}