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

int main() {

    char s[11];
    scanf("%s", s);
    int l = strlen(s);


    if (s[0] == 'A') {
        int cnt = 0;
        int cposi;
        for (int i = 2; i < l - 1; i++) {

            if (s[i] == 'C') {
                cnt++;
                cposi = i;
            }
        }
        if (cnt == 1) {

            int isCheck = 0;
            for (int i = 1; i < l; i++) {
                if (i != cposi) {
                    if (!(s[i] >= 0 && s[i] <= 26)) {
                        isCheck = 1;
                        break;
                    }
                }
            }
            if (isCheck == 0) {
                printf("AC");
            } else {
                printf("WA");
            }
            return 0;

        }

    }
    printf("WA");


    return 0;
}