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 <bits/stdc++.h>
using namespace std;

int main() {
    string s;
    int cnt = 0, tmp;
    cin >> s;
    for (int i = 2; i < s.size() - 1; i++)
    {
        if (s[i] == 'C')
        {
            cnt++;
            tmp = i;
        }
    }
    if (s[0] != 'A' || cnt != 1)
    {
        cout << "WA" << endl;
        return 0;
    }
    
    for (int i = 1; i < tmp; i++)
    {
        if (isupper(s[i]))
        {
            cout << "WA" << endl;
            return 0;
        }
    }
    
    for (int i = tmp + 1; i < s.size(); i++)
    {
        if (isupper(s[i]))
        {
            cout << "WA" << endl;
            return 0;
        }
    }
    cout << "AC" << endl;
}