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>

int main(void)
{
  char s[10];
  int c=0,i,j;
  scanf("%s",s);
  if(s[0]=='A')
  {
    for(i=2;i<sizeof(s)-2;i++)
    {
      if(s[i]=='C')
      {
        c++;
        j=i;
      }

    }
    if(c==1)
    {
      c=0;
      for(i=1;i<sizeof(s)-1;i++)
      {
        if(s[i]<97||s[i]>122)
        {
          c++;
        }
      }
      if(c==1) printf("AC");
      else printf("WA");
    }
    else printf("WA");
  }
  else printf("WA");
  return 0;
}