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 <stdlib.h>
#include <string.h>

int main()
{
   char arr[100];
   int i,n,flag,k;
   gets(arr);
   flag=0;k=0;
   n=strlen(arr);
  if(n>=4&&n<=10)
  {
       if(arr[0]=='A')
   {
       if(arr[1]>='a'&&arr[1]<='z')
       {
           if(arr[n-1]>='a'&&arr[n-1]<='z')

           {
               if(n==4)
               {
                   if(arr[2]!='C') flag=0;
               }
               if(n>4)
               {
                   for(i=2;i<n-1;i++)
                {
                 if(arr[i]=='C') flag+=1;
                 if(arr[i]>='A'&&arr[i]<='Z'&&arr[i]!='C') k+=1;
                }
               }

           }
       }
   }
  }
   if(flag==1&&k==0) printf("AC\n");
   else printf("WA\n");
   return 0;
}