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 {
	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);
		String str = scan.nextLine();

		char[] charArray = new char[str.length()];
		for (int i = 0; i < str.length(); i++) {
			charArray[i] = str.charAt(i);
		}
		if (charArray[0] != 65) {
			System.out.println("WA");
		} else if (Character.isUpperCase(charArray[1])) {
			System.out.println("WA");

		} else {
			int count = 0;
			for (int i = 2; i < str.length() - 1; i++) {
				if (charArray[i] == 67) {
					count++;
				}
			}
			if (count == 1) {
				if (charArray[str.length() - 1] != 67 && Character.isLowerCase(charArray[str.length() - 1])) {
					System.out.println("AC");
				} else {
					System.out.println("WA");
				}
			} else {
				System.out.println("WA");
			}

		}

	}
}