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.math.BigDecimal;
import java.math.MathContext;
import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        char[] ca = scanner.next().toCharArray();
        boolean fl1 = false;
        if(ca[0] != 'A'||Character.isUpperCase(ca[1])){
            System.out.println("WA");
            return;
        }
        for (int n = 2;n < ca.length - 1;++n){
            if(ca[n] == 'C'){
                if(fl1){
                    System.out.println("WA");
                    return;
                }
                else fl1 = true;
            }
            else if(Character.isUpperCase(ca[n])){
                System.out.println("WA");
                return;
            }
        }
        if(fl1&&Character.isLowerCase(ca[ca.length - 1])){
            System.out.println("AC");
        }
        else{
            System.out.println("WA");
        }
    }
}