import java.util.Scanner;

public class yukicoder_201 {
	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		
		String sa = stdIn.next();
		long pa = stdIn.nextLong();
		String xa = stdIn.next();
		
		String sb = stdIn.next();
		long pb = stdIn.nextLong();
		String xb = stdIn.next();
		
		if (pa > pb) {
			System.out.println(sa);	
		} else if (pa == pb) {
			System.out.println(-1);
		} else {
			System.out.println(sb);	
		}
	}
}