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 sc = new Scanner(System.in);
		String s = sc.next();
		String [] sArray = s.split("");
		int len = sArray.length;
		boolean judge = true;
		int Ccount = 0;
		if(sArray[0].equals("A"));//1文字目の”A”判定
		else judge = false;
		if(sArray[1].equals(sArray[1].toUpperCase())) judge = false;//２文字目の(大小)判定
		for(int i = 2; i <= len - 2; i++) {//3文字目と末尾から2文字目の間
			if(sArray[i].equals("C")) Ccount++;//”C”カウント
			else if(sArray[i] == sArray[i].toUpperCase()) judge = false;//(大小)判定
		}
		if(Ccount != 1) judge = false;//”C”の数判定
		if(sArray[len - 1].equals(sArray[len - 1].toUpperCase())) judge = false;//末尾文字の(大小)判定
		
		if(judge) System.out.println("AC");//結果出力
		else System.out.println("WA");
		
		sc.close();
	}
}