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 <cmath>
#include <string>
using namespace std;

int main(){
  string S;
  cin >> S;
  string ans;
  bool a, b, c;
  int cnt = 0;
  a = (S[0] == 'A');
  int cu = 0;

  for(int i=2;i<S.size()-1;i++){
    if(S[i] == 'C'){
      cnt++;
      cu = i;
    }
  }
  if(cnt == 1){
    c = true;
  }else{
    c = false;
  }

  for(int i=1;i<S.size();i++){
    if((S[i]<'a' || 'z'<S[i]) && i !=cu){
      b = false; 
      break;
    }
    if(i == S.size() - 1){
      b = true;
    }
  } 

  if(a && b && c){
    ans = "AC";
  }else{
    ans = "WA";
  }
  cout << ans <<"\n";
}