#include<iostream>
using namespace std;

int main(){

	char name[2][102];
	char point[2][10002] = {0};
	char te[2][10];
	
	for(int i=0; i<2; i++){
		cin >> name[i];
		cin >> point[i];
		cin >> te[i];
	}
	
	
	int i = 0;
	while(point[0][i] == point[1][i] && i < 10002){
		i++;
	}
	
	if(point[0][i] > point[1][i]){
		cout << name[0] << endl;
	}else if(point[0][i] < point[1][i]){
		cout << name[1] << endl;
	}else{
		cout << -1 << endl;
	}
	
	
	return 0;
}