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 <stdlib.h>
#include <string.h>

int main() {

	char input[10];
	int acFlag = 1;

	scanf("%s", input);

	int str_length = (strlen(input) <= 10 ? strlen(input) : 10);

	//printf("%d", str_length);

	if (input[0] != 'A') acFlag = 0;

	int i, cnt = 0;
	for (i = 1; i < str_length; i++) {

		if (i>=2 && i<=str_length-2 && input[i] == 'C') {
			cnt++;
		}
		else {
			if (!(input[i] >= 'a' && input[i] <= 'z')) {
				acFlag = 0;
			}
		}

	}
	if (cnt != 1) acFlag = 0;

	if (acFlag == 1) {
		printf("AC");
	}
	else {
		printf("WA");
	}

	return 0;
}