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: Accepted)

import java.util.Scanner;

public class Main {

    private static boolean containsC(String s) {
        String[] str = s.split("");
        int cCount = 0;
        for (int i = 2; i < str.length - 1; i++) {
            if ("C".equals(str[i])) {
                cCount++;
            }
        }
        return cCount == 1;
    }

    private static boolean isLowerCaseWoAAndC(String s) {
        String[] str = s.split("");
        for (int i = 1; i < str.length; i++) {
            if ("C".equals(str[i])) {
                continue;
            }
            if (str[i].equals(str[i].toUpperCase())) {
                return false;
            }
        }
        return true;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if ("A".equals(s.substring(0, 1))
                && containsC(s)
                && isLowerCaseWoAAndC(s)) {
            System.out.println("AC");
            return;
        }
        System.out.println("WA");
    }

}