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.

1 7 9 4

YES

We can get $1974$ by swapping $N_2$ and $N_3$.

1 9 7 4

YES

We already have $1974$ before doing anything.

1 2 9 1

NO

4 9 0 8

NO