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: Runtime Error)

import java.io.IOException;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws NumberFormatException, IOException {
		try (Scanner sc = new Scanner(System.in);) {
			String a = sc.next();
			String[] b = a.split("");

			String c = a.toUpperCase();
			String[] d = c.split("");

			String flag = "WA";

			int countC = 0;
			for (String st : b) {
				if (st.equalsIgnoreCase("C")) {
					countC++;
				}
			}

			int countLower = 0;
			for (int i = 0; i < d.length; i++) {
				if (b[i].equals(d[i])) {
					countLower++;
				}
			}

			if (b[0].equals("A") || b[0].equals("a")) {
				if (b[2].equals("C") || b[-2].equals("C")) {
					if (countC == 1) {
						if (countLower == 2) {
							flag = "AC";
						}
					}
				}
			}
			System.out.println(flag);
		}

	}

}