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>

using namespace std;

int main()
{
    string k;
    cin>>k;
    int counter = 0;
    int upper = 0;
    for(int i = 2 ; i < k.size();i++)
    {
        if(k[i]=='C')
        {
            counter++;
        }
    }
    for(int i = 0 ; i < k.size();i++)
    {
        if (isupper(k[i]))
        {
            upper++;
        }
    }
    if(counter == 1 && k[0]=='A' && islower(k[1]) && upper == 2)
    {
        cout<<"AC"<<endl;
    }
    else if (k[1]== 'c'|| k[1]=='C')
    {
        cout<<"WA"<<endl;
    }
    else
    {
        cout<<"WA"<<endl;
    }
}