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 <bits/stdc++.h>
using namespace std;

int main()
{
     ios_base::sync_with_stdio(false);
    cin.tie(NULL);
     string s;
     cin>>s;
     int n=s.length();
     if(s[0]!='A'){cout<<"WA\n"; return 0;}int c=0;
     for(int i=2;i<n-1;i++)
     {
     if(s[i]=='C')c++;
     }
     if(c!=1){cout<<"WA\n"; return 0;}
     for(int i=1;i<n;i++)
     {
         if(i>=2&&i<n-1&&s[i]=='C')continue;
         if(s[i]<='Z'&&s[i]>='A') {cout<<"WA\n"; return 0;}
     }
     cout<<"AC\n";
return 0;
}