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>
#include<ctype.h>

int main(void){
  int i;
  char s[11];
  int flag = 0;
  scanf("%s", s);
  if ( !islower(s[1]) ) {
    printf("WA\n");
    return 0;
  }
  for ( i = 3; i < strlen(s) - 1; i++ ) {
    if ( s[i] == 'C' || !islower(s[i]) ) {
      flag += 1;
    }
  }
  if ( !islower(s[i]) ) {
    flag += 1;
  }
  if ( flag != 1 ) {
    printf("WA\n");
  } else {
  	printf("AC\n");
  }
  return 0;
}