import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		String n1 = sc.next();
		String p1 = sc.next();
		String x1 = sc.next();
		String n2 = sc.next();
		String p2 = sc.next();
		String x2 = sc.next();

		if (p1.length() > p2.length()) {System.out.println(n1);}
		else if (p2.length() > p1.length()) {System.out.println(n2);}
		else {
			if (p1.compareTo(p2) < 0) {System.out.println(n2);}
			else if (p1.compareTo(p2) > 0){System.out.println(n1);}
			else {System.out.println(-1);}
		}
	}
}