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>
using namespace std;
int cnt,a;
int main()
{ 
  string s;
  cin >> s;
  bool can = 1;
  a = s.size();
  if(s[0]!='A')
  {
    can = 0;
  }
  if(s[1]=='C' ||s[a-1]=='C')can=0;
  for (int i = 2;i<a-1;i++)
  {
    if(s[i]=='C')
      cnt++;
    if(cnt>1)
    {
      can = 0;
      break;
    }
  }
  if(cnt==0)can=0;
  for (int i = 1; i < a;i++)
  {
    if(s[i]!='A'&&s[i]!='C')
    {
      if(s[i]<'a')
      {
        can = 0;
        break;
      }
    }
  }
  cout << (can ? "AC" : "WA") << endl;
}