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.*;

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        char[] a = s.toCharArray();

        int flag = 0;
        if(a[0] != 'A'){
            flag++;
        }
        int flag2 = 0;
        for(int i = 1;i<a.length;i++){
            if(Character.isUpperCase(a[i])){
                flag2++;
            }
        }
        if(s.indexOf("C") != s.lastIndexOf("C") || s.indexOf("C") == 0 || s.indexOf("C") == 1 || s.lastIndexOf("C")+1 == s.length()){
            flag++;
        }

        if(flag == 0 && flag2 == 1){
            System.out.println("AC");
        }else{
            System.out.println("WA");
        }
    }
}