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 {

	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		long [] n= {0,0,0,0};
		n[0]=sc.nextLong();
		n[1]=sc.nextLong();
		n[2]=sc.nextLong();
		n[3]=sc.nextLong();
		int i;int c=0;
		for(i=0;i<4;i++) {
			if(n[i]==1) {c++;}
			if(n[i]==9) {c++;}
			if(n[i]==7) {c++;}
			if(n[i]==4) {c++;}
		}
		if(c==4) {
			System.out.println("YES");
		}else {
			System.out.println("NO");
		}
		
	}

}