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 Go (1.6) (judge verdict: Wrong Answer)

package main

import "fmt"

func main() {
	var num1, num2, num3, num4 int
	var ans string
	fmt.Scanf("%d %d %d %d\n", &num1, &num2, &num3, &num4)

	if num1 == 1 || num2 == 1 || num3 == 1 || num4 == 1 {
		if num1 == 9 || num2 == 9 || num3 == 9 || num4 == 9 {
			if num1 == 7 || num2 == 7 || num3 == 7 || num4 == 7 {
				if num1 == 4 || num2 == 4 || num3 == 4 || num4 == 4 {
					ans = "YES"
				} else {
					ans = "NO"
				}
			} else {
				ans = "NO"
			}
		} else {
			ans = "NO"
		}
	}
	fmt.Println(ans)

}