import java.util.Scanner;

public class Main {
	public static void main(String[] a) {
		Scanner s = new Scanner(System.in);
		String[][] t = {s.nextLine().split("\\."),s.nextLine().split("\\.")};
		int[] S = new int[2];for(int i=0;i<2;i++)for(int j=0;j<3;)S[i]=S[i]*100+Integer.parseInt(t[i][j++]);
		System.out.println(S[0]<S[1]?"NO":"YES");
	}
}