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.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String str = s.next();
        String ans = "WA";
        out: if(str.charAt(0) == 'A' && Character.isLowerCase(str.charAt(1)) && Character.isLowerCase(str.charAt(str.length()-1))){
            for(int i = 2; i < str.length()-1; i++){
                char c = str.charAt(i);
                if(Character.isUpperCase(c)){
                    if(c == 'C'){
                        if(ans == "AC"){
                            ans = "WA";
                            break out;
                        }
                        else
                            ans = "AC";
                    }
                    else
                        break out;
                }
                
            }
        }
        System.out.println(ans);
        
    }
    
}