#include <algorithm>
#include <array>
#include <cmath>
#include <cstdio>
#include <iostream>
#include <numeric>
#include <optional>
#include <queue>
#include <unordered_map>
#include <unordered_set>
#include <vector>

using namespace std;

int main() {
    string sa, sb, xa, xb;
    int32_t pa, pb;
    cin >> sa >> pa >> xa >> sb >> pb >> xb;
    string ans;
    if (pa == pb)
        ans = "-1";
    else if (pa > pb)
        ans = sa;
    else
        ans = sb;
    cout << ans << endl;
    return 0;
}