import java.util.Scanner;
public class No138 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		// ドットで区切って文字列配列に格納
		String[] kasekiVerString = sc.next().split("\\.");
		String[] hanteiVerString = sc.next().split("\\.");
		int[] kasekiVer = new int[3];
		int[] hanteiVer = new int[3];
		sc.close();
		// 文字列からIntに変換して配列に格納
		for(int i = 0; i < 3; i++){
			kasekiVer[i] = Integer.valueOf(kasekiVerString[i]);
			hanteiVer[i] = Integer.valueOf(hanteiVerString[i]);
		}
		String kaseki = "YES";
		if(kasekiVer[0] < hanteiVer[0]){
			kaseki = "NO";
		}else if(kasekiVer[0] == hanteiVer[0]){
			if(kasekiVer[1] < kasekiVer[1]){
				kaseki = "NO";
			}else if(kasekiVer[1] == hanteiVer[1]){
				if(kasekiVer[2] < kasekiVer[2]){
					kaseki = "NO";
				}
			}
		}
		System.out.println(kaseki);
	}
}