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 Java7 (OpenJDK 1.7.0) (judge verdict: Wrong Answer)

import java.util.*;
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String S= sc.next();
        byte[] ascii;
        int countA=0;
        int countC=0;
        int Omoji=0;
        try{
            ascii =S.getBytes("US-ASCII");
        }catch(Exception e){
            e.printStackTrace();
            return;
        }
        int a=ascii[0];
        int c = ascii[2];
        if(a==65)countA++;
        for(int i=0;i<ascii.length;i++){
            int b=ascii[i];
            if(b>=65&&b<=90)Omoji++;
            if(b==67&&i<ascii.length-2&&i!=1)countC++;
        }
        if(countA==1&&countC==1&&Omoji==2)System.out.println("AC");
        else System.out.println("WA");
    }
}