#include<iostream>
#include<fstream>
#include<sstream>
#include<string>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<ctime>
#include<stack>
#include<queue>
#include<set>
#include<map>
#include<vector>
#include<list>
#include<algorithm>
#include<utility>
#include<complex>
#include<functional>
using namespace std;


int main(void){
	string a, b, pa, pb,c;
	cin >> a >> pa >> c;
	cin >> b >> pb >> c;
	c = "-1";
	if (pa.size() > pb.size())cout << a << endl;
	else if (pa.size() < pb.size())cout << b << endl;
	else if (pa > pb)cout << a << endl;
	else if (pa < pb)cout << b << endl;
	else cout << c << endl;

	return(0);
}