import java.util.*;
import java.math.BigInteger;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String sa = sc.next();
    String pa = sc.next();
    String xa = sc.next();
    String sb = sc.next();
    String pb = sc.next();
    String xb = sc.next();
    BigInteger num1 = new BigInteger(pa);
    BigInteger num2 = new BigInteger(pb);
    String ans = "-1";
    if(num1.compareTo(num2) > 0) ans = sa;
    if(num1.compareTo(num2) < 0) ans = sb;
    System.out.println(ans);
  }
}