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: Runtime Error)

#include <iostream>
#include <vector>
#include <cmath>
#include <algorithm>
#include <stdio.h>
#include <string>

using namespace std;

int main(){
 string S;
 cin >> S;
 int upper = 0;
 int answer = 0, so = 0;
 so = S.size() - 3;
 if(S.size() > 3){
  if(S.at(0) == 'A'){
    for(int i = 2; i < so; i++){
      if(S.at(i) == 'C') answer++;
    }
  }
 }
 for(int i = 0; i < S.size() + 1; i++){
  if(isupper(S.at(i))) upper++;
 }
 if(answer == 1 && upper == 2){
  cout << "AC" << endl;
 }else{
  cout << "WA" << endl;
 }
}