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)

#include <bits/stdc++.h>
using namespace std;
#define ll long long

int main(){
  string S;
  char a[2];
  cin>>S;
  int i=0;
  int cou=0;
  int b[2];
  int Flag=0;


  while(S[i]!='\0'){
    if(isupper(S[i]&&Flag!=1)){
      a[cou] = S[i];
      b[cou] = i;
      cou++;
      if(cou > 2){
        Flag=1;
      }
    }
    i++;
  }

  if(Flag==1){
    cout<<"WA"<<endl;
  }
  else{
    if(a[0] == 'A' && b[0]==0){
      if(a[1]=='C' && 1<b[1] && b[1]<i){
        cout<<"AC"<<endl;
      }
      else{
        cout<<"WA"<<endl;
      }
    }
    else cout<<"WA"<<endl;
  }

}