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

int main(){
	int s1,s2;
	string p1,p2,x1,x2;
	
	cin>>s1>>p1>>x1;
	cin>>s2>>p2>>x2;
	
	if(s1>s2){
		cout<<p1<<endl;
	}else if(s1<s2){
		cout<<p2<<endl;
	}else{
		cout<<-1<<endl;
	}
}