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 Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.*;

class Main
{
    public static void main (String[] args)
    {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();

        String ans;

        if(s.charAt(0) != 'A' || s.charAt(1) > 'z' || s.charAt(s.length() - 1) > 'z') ans = "WA";

        else{
            int c_count = 0;
            int small_count = 0;
            int other = 0;
            for(int i = 2; i < s.length() - 1; i++){
                if(s.charAt(i) == 'C')     c_count++;
                else if(s.charAt(i) <= 'z' && s.charAt(i) >= 'a') small_count++;
                else other++;
            }

            if(c_count == 1 && small_count == s.length() - 4 && other == 0) ans = "AC";
            else ans = "WA";
        }

        System.out.println(ans);
    }
}