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.nextLine().split("");
		String ans="WA";
		if(S[0].equals("A")) {
			int cnt=0;
			for(int i=2;i<S.length-1;i++) {
				if(S[i].equals("C"))cnt=cnt+1;
			}
			if(cnt==1){
				int upcnt=0;
				for(int i=0;i<S.length;i++) {
					if(Character.isUpperCase( S[i].charAt( 0 ) ) ) {
						upcnt=upcnt+1;
					}
				}
				if(upcnt>2) {
				}else {
					ans="AC";
				}
			}
		}
		System.out.println(ans);
	}
}