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 Fortran (gfortran v4.8.4) (judge verdict: Wrong Answer)

program main
integer(8)::a(4),i,c,j,p
	read*,a
	do j = 1,4
		c =0
		p = (j-1)*3+1
		if (p == 10) p = 9
		do i = 1,4
			if(a(i) == p) c = 1
		enddo
		if(c == 0)then
			print "(a)","NO"
			print *,j
			stop
		endif
	enddo
	
	print"(a)","YES"

end program main