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 {
    	public static void main (String[] args) {
    		Scanner sc = new Scanner(System.in);
    		String S = sc.next();
    		
    		if (S.charAt(0) != 'A') {
    			System.out.println("WA");
    			return;
    		}
    		
    		int countC = 0;
    		
    		for (int i = 2; i < S.length() - 1; i++) {
    			
    			if (S.charAt(i) == 'C') {
    				countC++;
    				
    			}
    		}
    		
    		if (countC != 1) {
    			System.out.println("WA");
    			return;
    		}
    		
    		for (int i = 1; i < S.length(); i++) {
    			
    			if( Character.isUpperCase(S.charAt( i )) && S.charAt( i ) != 'C')  {
    				System.out.println("WA");
        			return;
    			}
    		}
    		
    		System.out.println("AC");
    		
    	}
    }