import java.math.BigInteger;
import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
	
		String SA = sc.next(); 
		String PA = sc.next();
		String XA = sc.next();
		
		String SB = sc.next(); 
		String PB = sc.next();
		String XB = sc.next();
		
		BigInteger bigPA = new BigInteger(PA);
		BigInteger bigPB = new BigInteger(PB);
		
		if(bigPA.compareTo(bigPB) > 0) {
			System.out.println(SA);
		} else if(bigPA.compareTo(bigPB) < 0) {
			System.out.println(SB);
		} else {
			System.out.println(-1);
		}
	}
}