#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <cstdio>
#include <functional>
#include <set>
#include <sstream>
#include <map>
#include <queue>
#include <stack>

using namespace std;


int main()
{
	string name1,name2,score1,score2,dummy1,dummy2;
	cin>>name1>>score1>>dummy1>>name2>>score2>>dummy2;
	
	if(score1<score2) cout<<name2<<endl;
	else if(score1>score2) cout<<name1<<endl;
	else cout<<"-1"<<endl;

	return 0;
}