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 C (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
#include <ctype.h>
#include <string.h>

int main(void)
{
  char s[11];
  int len,i,c = 0;

  scanf("%s",s);

  len = strlen(s);

  if(s[0] != 'A')
    goto WA;

  for(i = 2; i < len-1; i ++)
    if(s[i] == 'C')
      c++;

  if(c != 1)
    goto WA;

  if(! islower(s[1]))
    goto WA;

  for(i = 2; i < len-1; i ++)
    if(!(islower(s[i]) || s[i] == 'C'))
      goto WA;

   if(! islower(s[len-1]))
    goto WA;

  printf("AC\n");
  return(0);

WA:
  printf("WA\n");
  return(0);
}