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 <iostream>
#include <string>

using namespace std;

int main()
{
     string R;                             cin >> R;
    if(R.length()<=10 && R.length()>=4)
    {
        int lenR=R.length();
        if(R[0]!='A')
        {
            cout<< "WA"; return 0;
        }
        if(!(R[1]>='a' && R[1]<='z'))
        {
            cout<< "WA";          return 0;
        }
        if(!(R[lenR-1]>='a' && R[lenR-1]<='z'))
        {
            cout<< "WA";           return 0;
        }
        else
        {
            int count=0;
            for(int i=2;i<lenR-1;i++)
            {
                if(R[i]=='C')
                {
                    count++;
                }
                else if(!(R[i]>='a' && R[i]<='z'))
                {
                    cout<< "WA";                 return 0;
                }
            }
            if(count!=1)   {      cout<< "WA";         return 0;    }
            cout<< "AC";
            return 0;      }   }
    else   {
        cout<< "WA";
        return 0;
    }}