import java.util.Scanner;

class No_201 {
	public static void main(String args[]) {
		Scanner stdIn = new Scanner(System.in);

		String[] name = new String[2];
		String [] point = new String[2];
		char [] hand = new char[2];

		for (int i = 0; i < 2; i++) {
			name[i] = stdIn.next();
			point[i] = stdIn.next();
			hand[i] = stdIn.next().charAt(0);
		}
		if (point[0].length() > point[1].length()) {
			System.out.println(name[0]);
		} else if (point[1].length() > point[0].length()) {
			System.out.println(name[1]);
		} else if (point[0].length() == point[1].length()){
			for (int i = 0; i < point[0].length(); i++) {
				if ( Character.getNumericValue(point[0].charAt(i)) > Character.getNumericValue(point[1].charAt(i))) {
					System.out.println(name[0]);
					System.exit(0);
				} else if (Character.getNumericValue(point[1].charAt(i)) > Character.getNumericValue(point[0].charAt(i))) {
					System.out.println(name[1]);
					System.exit(0);
				}	else {
					continue;
				}
			}
			System.out.println(-1);
		}
	}
}