Problem:
Score : 100 points

Problem Statement

You are given four digits N_1, N_2, N_3 and N_4. Determine if these can be arranged into the sequence of digits "1974".

Constraints

0 \leq N_1, N_2, N_3, N_4 \leq 9

N_1, N_2, N_3 and N_4 are integers.

Input

Input is given from Standard Input in the following format:

N_1 N_2 N_3 N_4

Output

If N_1, N_2, N_3 and N_4 can be arranged into the sequence of digits "1974", print YES; if they cannot, print NO.

Sample Input 1

1 7 9 4

Sample Output 1

YES

We can get 1974 by swapping N_2 and N_3.

Sample Input 2

1 9 7 4

Sample Output 2

YES

We already have 1974 before doing anything.

Sample Input 3

1 2 9 1

Sample Output 3

NO

Sample Input 4

4 9 0 8

Sample Output 4

NO

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.*;
public class Main {// Main
    public static void main(String[] args){

        Scanner sc =   new Scanner(System.in);
        int[]  N ;
         N = new int[4];
         N[0] = sc.nextInt();
         N[1] = sc.nextInt();
         N[2] = sc.nextInt();
         N[3] = sc.nextInt();

        Arrays.sort(N);

        if(N[0]==1){
            if(N[1]==4){
                if(N[2]==7){
                    if(N[3]==9){
                        System.out.println("YES");
                    }
                }
            }
        }else{
            System.out.println("NO");
            }


    }

}