import java.util.Scanner;
public class No138 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String[] kasekiVer = sc.next().split("\\.");
		String[] hanteiVer = sc.next().split("\\.");
		sc.close();
		String kaseki = "YES";
		for(int i = 2; i >= 0; i--){
			if(Integer.valueOf(kasekiVer[i]) > Integer.valueOf(hanteiVer[i])){
				kaseki = "YES";
			}else{
				kaseki = "NO";
			}
		}
		System.out.println(kaseki);
	}
}