import java.math.*;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String aString = sc.next();
        String bString=sc.next();
        StringTokenizer aa = new StringTokenizer(aString, ".");
        StringTokenizer bb = new StringTokenizer(bString, ".");
        int a1=Integer.parseInt(aa.nextToken());
        int a2=Integer.parseInt(aa.nextToken());
        int a3=Integer.parseInt(aa.nextToken());
        int b1 = Integer.parseInt(bb.nextToken());
        int b2 = Integer.parseInt(bb.nextToken());
        int b3 = Integer.parseInt(bb.nextToken());
        if(a1<b1 ){
        	System.out.println("NO");
        	return;
        }else if(a1==b1){
        }else{
        	System.out.println("YES");
        	return;
        }
        if(a2<b2){
        	System.out.println("NO");
        	return;
        }else if(a2==b2){
        }else{
        	System.out.println("YES");
        	return;
        }
        if(a3<b3 ){
        	System.out.println("NO");
        	return;
        }else{
        	System.out.println("YES");
        	return;
        }
        
    }
}