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.util.*;
import java.math.BigInteger;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String str = sc.next();
        int countC = 0;
        int count = 0;
        
        if(str.charAt(0) == 'A' && !Character.isUpperCase(str.charAt(1))){
            //System.out.println("test");
            for(int i=2; i<str.length()-1; i++){
                if(str.charAt(i) == 'C'){
                    countC++;
                   //System.out.println("test1");
                }
                if(Character.isUpperCase(str.charAt(i))){
                    count++;
                    //System.out.println("test2");
                }
                if(countC > 1 || count >1){
                    //System.out.println("test3");
                    break;
                }
            }
        }else{
            
        }
        
        if(countC==1 && !Character.isUpperCase(str.charAt(str.length()-1))){
            System.out.println("AC");
        }else{
            System.out.println("WA");
        }
    }
}