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)

//A
#include <iostream>
using namespace std;
string S;
int i;
int main(){
  cin >> S;
  if(S.at(0) == 'A' && S.at(2) == 'C'){
    for (int i =0 ; i< S.length(); i++){
      if(i != 2 && S.at(i) == 'C'){
        cout << "WA" << endl;
        return 0;
      }
      if(i != 0 && i != 2 && 'A' <= S.at(i) &&  S.at(i) <='Z'){
        cout << "WA" << endl;
        return 0;
      }
    }
          cout << "AC"  << endl;
  }else {
    cout << "WA" << endl;
  }
  return 0;
}