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

int main()
{
    char S[12];
    int c_count=0,flg=0;
    scanf("%s",S);

    if( S[0] == 'A' ){
        for(int i=1;i<strlen(S);i++){
            if( S[i] < 'a' || S[i] > 'z' ){
                flg++;
            }
        }
        for(int i=2;i<strlen(S)-1;i++){
            if( S[i] == 'C' ){
                c_count++;
            }
        }
    }else{
        printf("WA\n");
        return 0;
    }

    if( flg == 1 && c_count == 1 ){
        printf("AC\n");
    }else{
        printf("WA\n");
    }

    return 0;
}