import java.util.Scanner;

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

	String str1 = scan.next();
	String str2 = scan.next();

	String ver1[] = str1.split("\\.", 0);
	String ver2[] = str2.split("\\.", 0);
	
        for(int i = 0; i < ver1.length; i++){
	    if(Integer.parseInt(ver1[i]) > Integer.parseInt(ver2[i])){
		System.out.println("YES");
		break;
	    }
	    else if(Integer.parseInt(ver1[i]) == Integer.parseInt(ver2[i])){
		if(i == ver1.length - 1){
		    System.out.println("YES");
		    break;
		}
		continue;
	    }
	    else{
		System.out.println("NO");
		break;
	    }

	}
	
	
    }
    
}