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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;

int main() {
	string S;
	cin >> S;

	string A = S.substr(2, S.size() - 3);

	if (S[0] == 'A') {
		if (count(A.begin(), A.end(), 'C') == 1) {
			sort(S.begin(), S.end());
			int Q = 0;
			for (int i = 0; i < S.size(); i++) {
				if (islower(S[i])) Q++;
			}

			if (S.size() - Q == 2) {
				cout << "AC" << endl;
				return 0;
			}
			else {
				cout << "WA" << endl;
				return 0;
			}
		}
		else {
			cout << "WA" << endl;
			return 0;
		}
	}
	else cout << "WA" << endl;

}