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 argc, char const *argv[])
{
    char s[10];
    int len, count, i;
    scanf("%s", s);
    len = strlen(s);
    if (s[0] != 'A')
    {
        printf("WA\n");
        return 0;
    }

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

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

    printf("AC\n");
    return 0;
}