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

int main(){
    string SA, SB, PA, PB, XA, XB;

    cin >> SA >> PA >> XA;
    cin >> SB >> PB >> XB;

    if(PA > PB){
        cout << SA << endl;
    }else if(PA < PB){
        cout << SB << endl;
    }else{
        cout << -1 << endl;
    }

    return 0;
}