#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <ctime>
#include <cctype>
#include <climits>
#include <iostream>
#include <string>
#include <vector>
#include <map>
#include <list>
#include <queue>
#include <deque>
#include <algorithm>
#include <numeric>
#include <utility>
#include <complex>
#include <memory>
#include <functional>
 
using namespace std;

int isbig(string score1, string score2) {
    if (score1.size() > score2.size()) return 1;
    if (score2.size() > score1.size()) return -1;
    for (int i = 0; i < score1.size(); i++) {
        if (score1[i] > score2[i]) {
            return 1;
        } else if (score2[i] > score1[i]) {
            return -1;
        }
    }
    return 0;
}

int main(int argc, char const *argv[]) {
    string name1, name2, score1, score2, temp;
    
    cin >> name1;
    cin >> score1;
    cin >> temp;
    cin >> name2;
    cin >> score2;
    int r = isbig(score1, score2);
    if (r == 1) {
        cout << name1 << endl;
    } else if (r == 0) {
        cout << "-1" << endl;
    } else {
        cout << name2 << endl;
    }
    return 0;
}