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

bool big(string a, string b){
	if (a.size() > b.size()) return true;
	if (b.size() > a.size()) return false;
	for (int i = 0; i < a.size(); i++)
	{
		if (a[i] > b[i]) return true;
		if (b[i] > a[i]) return false;
	}
	return false;
}

int main() {
	string name[2];
	string point[2];
	string meguru;
	cin >> name[0] >> point[0] >> meguru;
	cin >> name[1] >> point[1] >> meguru;
	string ans = "-1";
	if (big(point[0], point[1])) ans = name[0];
	if (big(point[1], point[0])) ans = name[1];
	cout << ans << endl;
	
}