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.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws Exception{
		// TODO 自動生成されたメソッド・スタブ
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String S = br.readLine();

		if(S.charAt(0) != 0x41){
			System.out.println("WA");
			return;
		}
		if(!(S.charAt(1)>0x60 && S.charAt(1)<0x7B)){
			System.out.println("WA");
			return;
		}
		int cnt = 0;
		for(int i=2;i<S.length()-1;i++){
			if(S.charAt(i) == 'C'){
				cnt++;
			}else if(!(S.charAt(i)>0x60 && S.charAt(i)<0x7B)){
				System.out.println("WA");
				return;
			}
		}
		if(cnt  != 1){
			System.out.println("WA");
			return;
		}
		if(!(S.charAt(S.length()-1)>0x60 && S.charAt(S.length()-1)<0x7B)){
			System.out.println("WA");
			return;
		}
		System.out.println("AC");
	}

}