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 <string.h>

int main(){
	char s[11];
	int ans = 1;
	scanf("%s", s);

	if (s[0] != 'A') {
		ans = 0;
	}
	int coutC = 0;
	for (int i = 2; i < strlen(s) - 1; ++i) {
		if (s[i] == 'C') {
			++coutC;
		}
	}
	if (coutC != 1) {
		ans = 0;
	}
	for (int i = 0; i < strlen(s); ++i) {
		if (s[i] != 'A' && s[i] != 'C') {
			if (s[i]  <=90) {
				ans = 0;
			}
		}
	}

	printf(ans ? "AC" : "WA");

	return 0;
}