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) throws Exception {

        Scanner sc = new Scanner(System.in);
        
        String S = sc.next();
        boolean isOK = true;
        boolean isC = false;
        
        for(int i = 0; i < S.length(); i++){
            
            char x = S.charAt(i);
            
            if( i == 0){
                if( x == 'A' ){
                    continue;
                }else{
                    isOK = false;
                    break;
                }
            }else if( i == 1 ){
                if( x - 'Z' > 0 ){
                    continue;
                }else{
                    isOK = false;
                    break;  
                }
            }else if( i == S.length()-1 ){
                if( x == 'C' || !isC ){
                    isOK = false;
                    break;
                }
            }else if( isC ){
                if( x - 'Z' <= 0 ){
                    isOK = false;
                    break;
                }
            } else {
                if( x == 'C' ){
                    isC = true;
                }else if( x - 'Z' <= 0 ){
                    isOK = false;
                    break;
                }
            }
            
        }
        
        System.out.println( isOK ? "AC" : "WA" );
    }
}