#include <iostream>
#include <vector>
using namespace std;

int main(){
	string a,b,c,d;
	long long int pa,pb;
	cin >> a >> pa >> c;
	cin >> b >> pb >> d;
	if( pa == pb ) cout << -1 << endl;
	else if( pa > pb ) cout << a << endl;
	else cout << b << endl;
	return 0;
}