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: Wrong Answer)

import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String S = scan.nextLine();
		int cnt = 0;
		int capitalC = 0;

		if (S.startsWith("A")) {
			cnt += 1;
		}
		for (int i = 2; i < S.length() - 1; i++) {
			if (S.substring(i).equals("C") && capitalC == 0) {
				cnt += 1;
				capitalC = i;
			}else {
				break;
			}
		}
		String lowS = toLower(S);
		for (int i = 0; i < S.length(); i++) {
			if (lowS.substring(i).equals(S.substring(i))){
				
			}else {
				cnt += 1;
			}
		}
		
		if (cnt == 4) {
			System.out.println("AC");
		}else {
			System.out.println("WA");
		}
	}
	
	public static String toLower(String S) {
		String str;
		str = S.toLowerCase();
		return str;
	}
}