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>
#define ll long long
using namespace std;

int main(){
    string a;
    cin >> a;
    ll n = a.size(), c = 0;
    if(a[0] == 'A' || a[1] == 'C' || a[n - 1] == 'C') {
        for(int i = 1; i < n; i++) {
            if(a[i] == 'C') {
                c++;
            } else if (isupper(a[i])) {
                c = 10;
                break;
            }
        }
        if(c == 1 && islower(a[1])) cout << "AC" << endl;
        else cout << "WA" << endl;
    } else cout << "WA" << endl;
    return 0;
}