package b2015_5_31;

import java.util.Scanner;

public class KasekiVer3 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s1 = sc.nextLine();
		String s2 = sc.nextLine();
		sc.close();
		String a = "";
		String b = "";
		int ca1 = 1;
		int ca2 = Nuki(s1, a, ca1).length() + 2;
		int cb1 = 1;
		int cb2 = Nuki(s2, b, cb1).length() + 2;
		int Voa = Integer.parseInt(Nuki(s1, a, ca1));
		int Vob = Integer.parseInt(Nuki(s2, b, cb1));
		int n = 0;
		for(int i = 0; i<4; i++){
			if(Voa >Vob){
				System.out.println("YES");
				break;
			}else if(Voa < Vob){
				System.out.println("NO");
				break;
			}else if(Voa==Vob){
			a = "";
			b = "";
			Voa = 0;
			Vob = 0;
			if(n==0){
				Voa =  Integer.parseInt(Nuki(s1, a, ca2));
				 Vob = Integer.parseInt(Nuki(s2, b, cb2));
			}else if(n==1){
				int ca3 = ca2 + 2;
				int cb3 = cb2 + 2;
				Voa =  Integer.parseInt(Nuki(s1, a, ca3));
				 Vob = Integer.parseInt(Nuki(s2, b, cb3));
				 if(Voa >Vob){
						System.out.println("YES");
						break;
					}else if(Voa < Vob){
						System.out.println("NO");
						break;
					}else if(Voa==Vob){
						System.out.println("YES");
						break;
					}
			}
			n++;
			}
		}
	}
	public static String Nuki(String s, String ab, int c){
		int t;
		while(!(s.substring(c-1, c)).equals(".")){
			ab+=s.substring(c-1, c);
			if(c==s.length()){
				break;
			}else if(c<s.length()){
				c++;
			}
	}
		return ab;
	}
	}