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();
        
        boolean ac = true;
        
        if(s.charAt(0) != 'A') ac = false;
        
        int c = 0;
        int index = 0;
        for(int i = 2; i <= s.length()-2; i++){
            if(s.charAt(i) == 'C'){
                c++;
                index = i;
            }
        }
        if(c != 1) ac = false;
        
        for(int i = 1; i < s.length(); i++){
            if(i == index) continue;
            if(!('a' <= s.charAt(i) && s.charAt(i) <= 'z')){
                ac = false;
            }
        }
        
        if(ac){
            System.out.println("AC");
        }else{
            System.out.println("WA");
        }
    }
}