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 {
	static String original;
	public static void main(String[] args) {
		Scanner reader = new Scanner(System.in);
		String S = reader.next();
		boolean flag = true;
		String ans;

		if (S.charAt(0) != 'A') {
			flag = false;
		}

		int C_index = S.indexOf('C');
		if (S.indexOf('C') > S.length() - 2 || S.indexOf('C') < 2) {
			flag = false;
		}

		for (int i = 1; i < S.length(); i++) {
			if (i != C_index && Character.isUpperCase(S.charAt(i))) {
				flag = false;
			}
		}
		
		if (flag) {
			ans = "AC";
		} else {
			ans = "WA";
		}

		System.out.print(ans);
	}


}