#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>
using namespace std;
using namespace boost::multiprecision;

int main() {
    string S[2], P[2], X[2];
    for (int i = 0; i < 2; i++) {
        cin >> S[i] >> P[i] >> X[i];
    }

    cpp_int Pa(P[0]), Pb(P[1]);
    if (Pa > Pb)
        cout << S[0] << endl;
    else if (Pb > Pa)
        cout << S[1] << endl;
    else
        cout << -1 << endl;
}