import java.math.BigInteger;
import java.util.Scanner;


public class Main {

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        String s = sc.next();
        BigInteger b = new BigInteger(sc.next());
        sc.next();
        String t = sc.next();
        BigInteger c = new BigInteger(sc.next());
        sc.next();
        if(b.compareTo(c)>0){
            System.out.println(s);
        } else if(b.compareTo(c)==0){
            System.out.println(-1);
        } else {
            System.out.println(t);
        }
    }

}