class Yuki {
	String name;
	java.math.BigInteger yurufuwa;
	String hand;

	String judge(Yuki y) {
		int i = this.yurufuwa.compareTo(y.yurufuwa);
		if (i == 0) {
			return "-1";
		} else {
			return i > 0 ? this.name : y.name;
		}
	}
}

class No_201 {
	public static void main(String[] args) {
		java.util.Scanner sc = new java.util.Scanner(System.in);
		Yuki[] yuki = new Yuki[2];

		for (int i = 0; i < yuki.length; i++) {
			yuki[i] = new Yuki();
			yuki[i].name = sc.next();
			yuki[i].yurufuwa = sc.nextBigInteger();
			yuki[i].hand = sc.next();

		}
		System.out.println(yuki[0].judge(yuki[1]));
		sc.close();
	}
}