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>

int main()
{
	char S[11];
	scanf("%s", S);
	
	int i, l, flag = 1, count = 0, mark[11] = {1};
	for (l = 0; S[l] != 0; l++);
	if (S[0] != 'A') flag = 0;
	for (i = 2; i <= l - 2; i++) {
		if (S[i] == 'C') {
			count++;
			mark[i] = 1;
		}
	}
	if (count != 1) flag = 0;
	for (i = 0; i < l; i++) {
		if (mark[i] == 0 && (S[i] < 'a' || S[i] > 'z')) flag = 0;
	}
	
	if (flag == 1) printf("AC\n");
	else printf("WA\n");
	fflush(stdout);
	return 0;
}