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.Scanner;

// これはきょーか(@ks96neko)が書いたやつ
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String r = sc.next();
        int rl = r.length();

        String r0 = r.substring(0, 0);
        String a = "A";

        String rb = r.substring(2, rl);

        int c1 = rb.indexOf("C");
        int cn = rb.lastIndexOf("C");


        if (a.equals(r0)) {
            if (c1 != -1 && cn != -1) {
                if (c1 != cn) {
                    System.out.println("WA");
                } else {
                    for (int i = 1; i <= rl; i++) {
                        if (i != c1 && !Character.isLowerCase(r.charAt(i))) {
                            System.out.println("WA");
                            return;
                        }
                    }
                    System.out.println("AC");
                }

            } else {
                System.out.println("WA");
            }
        } else {
            System.out.println("WA");
        }


    }

}