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: Runtime Error)

package ABC104;

import java.util.Scanner;

public class Main {
    public static void main(String args[]){
        Scanner scanner = new Scanner(System.in);
        String s = scanner.nextLine();
        if (s.startsWith("A")){
            char[] ss = s.toCharArray();
            int n =0;
            for (int i=1; i<ss.length;i++) {
                if (i >= 2 && i <= ss.length - 2) {
                    if (ss[i] == 'C') {
                        if (n == 1){
                            System.out.print("WA");
                            System.exit(0);
                            n+=1;
                        }
                    }
                }else if (Character.isUpperCase(ss[i])) {
                        System.out.print("WA");
                        System.exit(0);
                }
            }
            if (n != 0){
                System.out.print("AC");
            }else{
                System.out.print("WA");
            }
        }
    }
}