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

int main(void) {
string sa,ja;
string sb,jb;
string  ua,ub;
cin>>sa>>ua>>ja;
cin>>sb>>ub>>jb;

if(ua.length()>ub.length()){
	cout<<sa<<endl;
}else if(ua.length()==ub.length()){
	for (int i = 0; i < ua.length(); ++i) {
		if(ua[i]>ub[i]){
			cout<<sa<<endl;
			return 0;
		}else if(ua[i]<ub[i]){
			cout<<sb<<endl;
			return 0;
		}
	}
	cout<<-1<<endl;
}else if(ua.length()<ub.length()){
	cout<<sb<<endl;
}
}