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 <ctype.h>
#include <string.h>

typedef enum { false, true } bool;

int main(void)
{
    char S[11];
    int len;
    int i;
    int ctr = 0;
    bool flag = false;
    
    scanf("%s", S);
    
    
    len = strlen(S);
    
    if(S[0] == 'A')
    {
        if(!isupper(S[1]))
        {
            for(i=2; i<len-1; i++)
            {
                if(S[i] == 'C')
                    ctr++;
                else if(isupper(S[i]))
                    break;
            }
            if(!isupper(S[len]) && ctr == 1)
                flag = true;
        }
    }
    
    if(flag)
        printf("AC\n");
    else
        printf("WA\n");
        

    //system("pause");
    
    return 0;
}