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<algorithm>
#include<string>
using namespace std;
typedef long long ll;
int main(){
string s;
  cin>>s;
  if(s[0]=='A'){
    ll count=0;
  for(ll i=2;i<s.size()-1;i++){
  if(s[i]=='C')
    count++;
  }
    if(count==1){
       if(s[1]=='C'||s[s.size()-1]=='C'){
       cout<<"WA";
       }
            else{
              int flag=0;
      for(ll i=1;i<s.size();i++){
      if(s[i]-'a'<0&&s[i]!='C'){
      cout<<"WA";
        flag=1;
        break;
      }
      }
              if(flag==0){
              cout<<"AC";
              }
              
            }
    }
    else{
        cout<<"WA";
    }
  }
  else{
  cout<<"WA";
  }
return 0;
}