package no200;

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

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String sa = sc.next();
		BigInteger yurufuwaA = sc.nextBigInteger();
		sc.next();
		String sb = sc.next();
		BigInteger yurufuwaB = sc.nextBigInteger();
		sc.next();
		int comp = yurufuwaA.compareTo(yurufuwaB);
		if (comp < 0) {
			System.out.println(sb);
		}else if(comp > 0){
			System.out.println(sa);
		}else{
			System.out.println(-1);
		}
	}

}