package yukicoder;

import java.util.Scanner;

public class Yuki138 {
	
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		String str1 = scan.next();
		String str2 = scan.next();
		scan.close();
		System.out.println(judgeNumbers(str1, str2));
	}
	
	private static String judgeNumbers(String str1,String str2) {
		//String com_numbers1 = "";
		//String com_numbers2 = "";
		String[] str1arr = str1.split("\\.");
		String[] str2arr = str2.split("\\.");

		for(int i = 0; i < str1arr.length; i++){
				if(Integer.parseInt(str1arr[i])<Integer.parseInt(str2arr[i])){
					return "NO";
				}else if(Integer.parseInt(str1arr[i])>Integer.parseInt(str2arr[i])){
					break;
				}
		}
		/*
		for(int i = 0; i < str1arr.length; i++){
			com_numbers1 += str1arr[i];
		}
		for(int i = 0; i < str2arr.length; i++){
			com_numbers2 += str2arr[i];
		}
		
		
		if(Integer.parseInt(com_numbers1)<Integer.parseInt(com_numbers2)){
			return "NO";
		}
		*/
		return "YES";
	}
}