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 sc = new Scanner(System.in);
		String S = sc.next();
		sc.close();
		
		boolean ruleA = false;
		boolean ruleB = false;
		boolean ruleC = false;
		
		if(S.charAt(0) == 'A'){
			ruleA = true;
			int countC = 0;
			for(int a = 1 ; a < S.length() ; a++){
				String searchChar = String.valueOf(S.charAt(a));
				if(1<a && a<S.length()-1 && searchChar.equals("C")){
					countC++;
					if(countC == 1){
						ruleB = true;
					}else{
						ruleB = false;
						break;
					}
				}else{
					if(searchChar.matches("[a-z]")){
						ruleC = true;
					}else{
						break;
					}
				}				
			}			
		}
		if(ruleA && ruleB && ruleC){
			System.out.println("AC");
		}else{
			System.out.println("WA");
		}
	}
}