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.substring(0, 1).equals("A") || s.substring(1, 2).equals("C")) {
            System.out.println("WA");
        } else {
            int c = 0;
            for (int i = 2 ; i < s.length(); i++) {
                if (s.substring(i, i + 1).equals("C")) {
                    c++;
                }


            }
            int d = 0;
            for (int i = 0; i < s.length(); i++) {
                if (Character.isUpperCase(s.charAt(i))) {
                    d ++;
                }
            }
            if (c == 1 && !s.substring(s.length() -1, s.length()).equals("C") && d == 2) {

                System.out.println("AC");
            } else {
                System.out.println("WA");
            }
        }
    }

}