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 {

		static void solve() {
			Scanner sc = new Scanner(System.in);
			String s = sc.nextLine();
			int check = 0;
			String ans = "WA";
			sc.close();
			for(int i = 1;i<s.length();i++) {
				if(s.charAt(i)=='C') 
					check++;
			}
			if(s.charAt(0)=='A') {
				if(check<2) {
				if(s.charAt(1)!='C'&&s.charAt(s.length()-1)!='C'&&s.contains("C")) {
					ans = "AC";
				}
			}
		}
	
				System.out.println(ans);
		}
	public static void main(String[] args) {
		solve();

	}

}