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: Wrong Answer)

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

int main(void)
{
  char ch[100];
  int a, n, i, j;
  int t = 0;
  int p = 0;
  scanf("%s", ch);
  n = strlen(ch);

  if(n<4 || n>=11){
    printf("WA");
    return 1;
  }


  if(ch[0] == 'A')
    a = 0;
  else
    a = 1;

  for(i=2;i<=n-2;++i){
    if(ch[i] == 'C'){
      t+=1;
    }
  }

  if(t==1 && a==0){
    for(j=0;j<n-1;j++){
      if(islower(ch[j]) == 0){
        p+=1;
      }
    }

    if(p==2)
      printf("AC\n");
    else
      printf("WA\n");
  }
  else
    printf("WA\n");



  return 0;



}