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(){
  int i,len,count = 0;
  char s[10];

  scanf("%s",s);
  len = strlen(s);

  for(i=0;i<len;i++){
    if(s[i] <= 'Z'){
      count++;
    }
  }
  if(count != 2){
    printf("WA\n");
    return 0;
  }

  count = 0;

  if(s[0] == 'A'){
    for(i=2;i<len;i++){
      if(s[i] == 'C')
        count++;
    }
  }
  if(s[len-1] == 'C'){
    printf("WA\n");
    return 0;
  }

  if(count == 1)
    printf("AC\n");
  else
    printf("WA\n");

  return 0;
}