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 boolean check(String s) {
		if(s.charAt(0) != 'A') return false;
		if(s.substring(2, s.length() - 1).indexOf('C') != s.substring(2, s.length() - 1).lastIndexOf('C') || s.substring(2, s.length() - 1).indexOf('C') == -1) {
			return false;
		}
		char[] str = s.toCharArray();
		str[0] = 'a';
		str[s.substring(2, s.length() - 1).indexOf('C') + 2] = 'c';
		return String.valueOf(str).equals(s.toLowerCase());
	}
	static long mod = 1000000007;
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		if(check(S)) {
			System.out.println("AC");
		}else {
			System.out.println("WA");
		}
	}
}