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 <stdlib.h>
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
int main() {
    string s;
    cin>>s;
    int count=0;
    bool flag=false;
    if(s.at(0)=='A'){
      	if((s.at(1)>='A'&&s.at(1)<='Z')||(s.at(s.size()-1)>='A'&&s.at(s.size()-1)<='Z')){
          count=2;
        }
        for(int i=2;i<=s.size()-2;i++){
            if(s.at(i)=='C'){
                count++;
            }
            else if(s.at(i)>='A'&&s.at(i)<='Z'){
                    count=2;
                }   
        }
        if(count==1){
            flag=true;
        }
    }
    if(flag==true){
        cout<<"AC"<<endl;
    }
    else{
        cout<<"WA"<<endl;
    }
}