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>
 
int main()
{
  char s[15];
  gets(s);
  int l=strlen(s),b=0,count=0,i;
  if(s[0]!='A'||s[1]=='C'||s[l-1]=='C')
  {
    b=1;
  }
  for(i=1;i<l;i++)
  {
    if(i!=2||i!=l-1)
    {
      if(s[i]=='c')
      {
        count++;
      }
    }
    if(s[i]!='c'&&s[i]<'a')
    {
      b=1;
      break;
    }
  }
  if(count!=1)
  {
    b=1;
  }
  if(b==1)
  {
    printf("AC");
  }
  else 
  {
    printf("WA");
  }
  return 0;
}