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

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final String Sa = sc.next();
		final BigInteger Pa = new BigInteger(sc.next());
		final String Xa = sc.next();
		final String Sb = sc.next();
		final BigInteger Pb = new BigInteger(sc.next());
		final String Xb = sc.next();
		
		if(Pa.compareTo(Pb) < 0){
			System.out.println(Sb);
		}else if(Pa.compareTo(Pb) > 0){
			System.out.println(Sa);
		}else{
			System.out.println(-1);
		}
				
		
	}
	
}