Problem:
Score : 200 points

Problem Statement

You are given a string S. Each character of S is uppercase or lowercase English letter.
Determine if S satisfies all of the following conditions:

The initial character of S is an uppercase A.

There is exactly one occurrence of C between the third character from the beginning and the second to last character (inclusive).

All letters except the A and C mentioned above are lowercase.

Constraints

4 ≤ |S| ≤ 10 (|S| is the length of the string S.)

Each character of S is uppercase or lowercase English letter.

Input

Input is given from Standard Input in the following format:

S

Output

If S satisfies all of the conditions in the problem statement, print AC; otherwise, print WA.

Sample Input 1

AtCoder

Sample Output 1

AC

The first letter is A, the third letter is C and the remaining letters are all lowercase, so all the conditions are satisfied.

Sample Input 2

ACoder

Sample Output 2

WA

The second letter should not be C.

Sample Input 3

AcycliC

Sample Output 3

WA

The last letter should not be C, either.

Sample Input 4

AtCoCo

Sample Output 4

WA

There should not be two or more occurrences of C.

Sample Input 5

Atcoder

Sample Output 5

WA

The number of C should not be zero, either.

Solution in Fortran (GNU Fortran 9.2.1) (judge verdict: Accepted)

program sample
    implicit none
    character(100)::s,t
    integer(8) :: i,j,k,m,n
    integer(8)::a,b,c,d
    integer(8),allocatable::x(:),y(:)
  
    read(*,*) s
    if(s(1:1) .ne. 'A')then
        write(*,*)'WA'
        stop
    end if
    n=len_trim(s)


    do i=3,n-1
        if(s(i:i) .eq. 'C')then
            t=s(1:i-1)//s(i+1:n)
           exit
        end if
        if(i==n-1)then
            write(*,*)'WA'
            stop
        end if
    end do
    do i=2,n-1
        if(ichar(t(i:i))<97)then
            write(*,*)'WA'
            stop
        end if
    end do
    write(*,*)'AC'


    stop
end program sample