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: Wrong Answer)

import java.util.*;

public class Main {
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        String str1 = scanner.nextLine();
        
        //先頭文字
        if(str1.charAt(0)=='A'){
            //先頭3文字目から後頭から2文字目までの間
            String str2 = str1.substring(2, str1.length()-1);
            int ct = 0;
            for(int i=0;i<str2.length();i++){
                if(str2.charAt(i) =='C'){
                    ct++;
                }
            }
            //AとC以外小文字
            if(ct==1){
                ct=0;
                for(int i=0;i<str1.length();i++){
                    if(Character.isUpperCase(str1.charAt(i))){
                        ct++;    
                    }
                }
                if(ct==2){
                    System.out.print("AC");
                    return;
                }
            }
            System.out.print("WA");
        }
    }
}