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;
 
typedef long long ll;
 
int main() {
	cin.tie(0);
    ios::sync_with_stdio(false);

    string S;
    cin >> S;

    if(S[0] != 'A') {
        cout << "WA" << endl;
        return 0;
    }

    int count = 0;

    for(int i = 2; i < S.length() - 1; i++) {
        if(S[i] == 'C')
            count++;
        else if(S[i] < 'a' || S[i] > 'z') {
            cout << "WA" << endl;
            return 0;
        }
    }

    if(S[1] < 'a' || S[1] > 'z' || S[S.length() - 1] < 'a' || S[S.length() - 1] > 'z') {
        cout << "WA" << endl;
        return 0;
    }


    if(count != 1)
        cout << "WA" << endl;
    else
        cout << "AC" << endl;    
    
}