import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class Main_yukicoder138 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String[] abc = {sc.next(), sc.next()};
        int[][] v = new int[2][3];

        String regex = "(\\d+)\\.(\\d+)\\.(\\d+)";
        Pattern p = Pattern.compile(regex);

        for (int i = 0; i < 2; i++) {
        	Matcher m = p.matcher(abc[i]);
        	if (m.find()) {
        		v[i][0] = Integer.parseInt(m.group(1));
        		v[i][1] = Integer.parseInt(m.group(2));
        		v[i][2] = Integer.parseInt(m.group(3));
        	}
        }

        boolean flag;
        if (v[0][0] < v[1][0]) {
        	flag = false;
        } else if (v[0][0] > v[1][0]) {
        	flag = true;
        } else {
            if (v[0][1] < v[1][1]) {
            	flag = false;
            } else if (v[0][1] > v[1][1]) {
            	flag = true;
            } else {
            	if (v[0][2] < v[1][2]) {
            		flag = false;
            	} else if (v[0][2] > v[1][2]) {
            		flag = true;
            	} else {
            		flag = true;
            	}        	
            }        	
        }

        if (flag) {
        	System.out.println("YES");
        } else {
        	System.out.println("NO");
        }
        
        sc.close();
    }
}