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>
 
int main()
{
  char s[16];
  scanf("%s", s);
  int len = strlen(s);
  int rc = 1;
  int i, cnt;

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

  cnt = 0;
  for (i = 1; i < len; i++) {
    if (s[i] <= 'Z') {
      if (i == 1 || i == len -1) {
        rc = 0;
      } else if (s[i] == 'C') {
        cnt++;
      }
    }
  }

  if (cnt != 1)
    rc = 0;

  printf(rc == 0 ? "WA" : "AC");
  return 0;
}