#include <iostream>
#include <math.h>
#include <algorithm>
#include <functional>
#include <vector>
#include <typeinfo>
#include <climits>
#include <ctype.h>
#include <string>
#include <stack>
using namespace std;
#define FOR(i, a, n) for (int i = a; i < n; i++)
#define REP(i, n) for(int i = 0; i < n; i++)
struct omt{omt(){ios::sync_with_stdio(false);cin.tie(0);}}star;

int main(){
    string Sa, Sb;
    long long Pa, Pb;
    char Xa, Xb;
    cin >> Sa >> Pa >> Xa;
    cin >> Sb >> Pb >> Xb;

    if(Pa > Pb) cout << Sa << endl;
    else if(Pa < Pb) cout << Sb << endl;
    else cout << -1 << endl;
    


    return 0;
}