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 "string.h"
main() {
    char s[11];
    int i, len, flag = 0;
    scanf("%s", s + 1);
    len = strlen(s);
    for(i = 1; i <= len; ++i) {
        if(i >= 3 && i <= len - 2 && s[i] == 'C' && !flag) {
            flag = 1;
            continue;
        } 
        if(i != 1 && s[i] >= 'A' && s[i] <= 'Z' || i == 1 && s[i] != 'A') {
            printf("WA\n");
            goto end;
        }
    }
    if(!flag) printf("WA\n");
    else printf("AC\n");
    end:;
}