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>
#include <algorithm>
#include <iomanip>
#include <ios>
#include <vector>
using namespace std;
int main(void){
  string s;
  cin >> s;

  int n = s.length();

  vector<int>judge(3,0);

  if(s[0] == 'A'){
    judge[0]++;
    s[0] = 'a';
  }

  for(int i=2;i<n - 1;i++){
    if(s[i] == 'C'){
      judge[1]++;
      s[i] = 'c';
    }
  }

  bool small = true;
  for(int i=0;i<n;i++){
    if(s[i] >= 'A' && s[i] <= 'Z')
      small = false;
  }

  if(small){
    judge[2]++;
  }

  /*for(int i=0;i<3;i++){
    cout << judge[i] << endl;
  }*/

  if(judge[0] * judge[1] * judge[2] == 1)
    cout << "AC" << endl;
  else
    cout << "WA" << endl;

  return 0;
}