import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String[] p1 = sc.nextLine().split(" ",0);
        String[] p2 = sc.nextLine().split(" ",0);
        
        String name1 = p1[0];
        String point1 = p1[1];
        String hand1 = p1[2];
        
        String name2 = p2[0];
        String point2 = p2[1];
        String hand2 = p2[2];
        
        if(point1.compareTo(point2) == 1) {
            if(point1.equals(point2)) {
                System.out.println("-1");
            }else{
                System.out.println(name1);
            }
        }else if(point1.equals(point2)) {
            System.out.println("-1");
        }else {
            System.out.println(name2);
        }
        
    }
}