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 JavaScript (node.js v5.12) (judge verdict: Accepted)

'use strict'

const main = (INPUT) => {
  const N = INPUT.split('\n')[0].split(' ')
  let ans = 'NO'
  if (N.indexOf('1') >= 0 && N.indexOf('9') >= 0 && N.indexOf('7') >= 0 && N.indexOf('4') >= 0) {
    ans = 'YES'
  }
  console.log(ans)
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'))