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: Wrong Answer)

#include <iostream>
#include <string>
#include <vector>
#include <stack>
#include <algorithm>
#include <numeric>
#include <math.h>
#include <stdio.h>
#include <ctype.h>
using namespace std;

#define N_MAX   (100000)
#define LL_MAX_NUM (1LL<<60)

typedef long long ll;
typedef long long int lli;

int main() {
	string S;
	cin >> S;
	int upperNum = 0;
	int Cnum = 0;
	for (int i = 0; i < S.size(); i++) {
		if (i == 0 && S[i] != 'A') {
			cout << "WA" << endl;
			return 0;
		}
		if (isupper(S[i]) != 0) {
			upperNum++;
		}
		if (i >= 1 && i <= S.size() - 2 && S[i] == 'C') {
			Cnum++;
		}
	}
	if (Cnum != 1) {
		cout << "WA" << endl;
		return 0;

	}
	if (upperNum != 2) {
		cout << "WA" << endl;
		return 0;
	}

	cout << "AC" << endl;
	return 0;
}