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>
#include <string.h>

int main(void)
{
  char s[10];
  int l,f,i,a,b;
  
  scanf("%s",s);
  l=strlen(s);
  f=0;
  if(s[0]=='A') f++;
  a=0;
  for(i=2;i<l-1;i++){
    if(s[i]=='C') a++;
  }
  if(a==1) f++;
  for(i=0;i<l;i++){
    if(((s[i]>='a')&&(s[i]<='z'))||(s[i]=='A')||(s[i]=='C')) b++;
  }
  if(b==l) f++;
  if(f==3) printf("AC");
  else printf("WA");
  return 0;
}