package m.shin;
import java.util.Scanner;
public class Con138 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		String[] verA = s.next().split("\\.",3);
		String[] verB = s.next().split("\\.",3);
		s.close();

		int[] A = new int[3] ,B = new int[3];
		for(int i = 0;i < 3;i++){
			A[i] = Integer.parseInt(verA[i]);
			B[i] = Integer.parseInt(verB[i]);
		}

		if(A[0] > B[0]){
			System.out.println("YES");
		}else if(A[0] == B[0]){
			if(A[1] > B[1]){
				System.out.println("YES");
			}else if(A[1] == B[1]){
				if(A[2] >= B[2]){
					System.out.println("YES");
				}else{
					System.out.println("NO");
				}
			}else{
				System.out.println("NO");
			}
		}else{
			System.out.println("NO");
		}
	}

}