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;

int main()
{
  string s;
  cin>>s;
  
  bool juge = true;
  
  string first = s.substr(0,1);
  if(first!="A"){
    juge = false;
   }
  
  int cnt=0;
  for(int i=2;i<s.length()-1;i++)
  {
   

    if(s[i]=='C'){
      cnt++;
    }
  }
  
  if(cnt !=1)
  {
      juge = false;
  }
  
  for(int i=0;i<s.length();i++)
  {
       string v = s.substr(i,1);
    
      if(v!="A"&&v!="C"&&v>"Z")
      {
          juge = false;
      }
    
  }
  
  
  if(juge)
  {
       cout<<"AC"<<endl;
  }
  else
  {
       cout<<"WA"<<endl;
  }
  
  return 0;
}