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;
import java.util.Arrays;

public class Main {

    public static void main(String[] args) {
        new Main().solve();
    }

    void solve() {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        char[] c = S.toCharArray();
        boolean ans1 = false;
        boolean ans2 = false;
        boolean ans3 = true;
        for (int i = 0; i < S.length(); i++) {
            if (i == 0 && c[i] == 'A') {
                ans1 = true;
                continue;
            }
            if (i >= 2 && ans2 == false && i <= S.length() - 2 && c[i] == 'C') {
                ans2 = true;
                continue;
            }
            if (Character.isUpperCase(c[i])) {
                ans3 = false;
            }
        }
        if (ans1 && ans2 && ans3) {
            System.out.println("AC");
        } else {
            System.out.println("WA");
        }

    }
}