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[]) {
        try (Scanner in = new Scanner(System.in)) {
            String S = in.next();
            boolean ac = true;
            if (S.charAt(0) == 'A') {
            } else {
                ac = false;
            }
            int count = 0;
            int index = -1;
            for (int i = 2; i <= S.length() - 2; i++) {
                if (S.charAt(i) == 'C') {
                    count++;
                    index = i;
                }
            }
            if (count == 1) {
            } else {
                ac = false;
            }
            for (int i = 1; i < S.length(); i++) {
                if (i == index) {
                    continue;
                }
                if (S.charAt(i) >= 'a' && S.charAt(i) <= 'z') {
                } else {
                    ac = false;
                }
            }
            System.out.println(ac ? "AC" : "WA");
        }
    }
}