#include <iostream>
#include <iomanip>

#include <algorithm>
#include <math.h>

#include <string>
#include <list>
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////

int main(void){
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed;//
    //cout << setprecision(6);//

	string name[2],poi[2],x[2];
	rep(i,2){
		cin>>name[i]>>poi[i]>>x[i];
	}
	if(poi[0].size() > poi[1].size() ){
		P(name[0]);return 0;
	}
	else if( poi[1].size() > poi[0].size() ){
		P(name[1]);return 0;
	}
	else{
		rep(i,poi[0].size()){
			if(poi[0][i] > poi[1][i]){
				P(name[0]);return 0;
			}
			else if(poi[1][i] > poi[0][i]){
				P(name[1]);return 0;
			}
			else{

			}
		}
	}

	P(-1);
    return 0;
}