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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <string.h>

bool isCapital(char a)
{
    if(a>='a') return false;
    else return true;
}

int main()
{
    char s[11];
    scanf("%s",s);
    int len=strlen(s);

    if(s[0]!='A')
    {
        printf("WA\n");
        return 0;
    }

    if(isCapital(s[1]))
    {
        printf("WA\n");
        return 0;
    }

    int Cn=0;
    for(int i=2;i<len-2;i++)
    {
        if(s[i]=='C') Cn++;
        else if(isCapital(s[i]))
        {
            printf("WA\n");
            return 0;
        }
    }

    if(Cn!=1)
    {
        printf("WA\n");
        return 0;
    }

    for(int i=len-2;i<len;i++)
    {
        if(isCapital(s[i]))
        {
            printf("WA\n");
            return 0;
        }
    }
    printf("AC\n");
    return 0;

}