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.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//int n=sc.nextInt();
		//long x=sc.nextLong();
		//long k=sc.nextLong();
		String s=sc.next();
		//String buff="";
		//long[] array=new long[n];
		int sum=0,buff,max=0,min=0;
		//int[] array=new int[l];
		//String s="",m="",h="";
		if(s.charAt(0)!='A' ||s.charAt(s.length()-1)=='C' || Character.isUpperCase(s.charAt(s.length()-1))) {
			System.out.println("WA");
			System.exit(0);
		}
		for(int i=2;i<=s.length()-2;i++) {
			if(s.charAt(i)=='C')sum++;
			else if(Character.isUpperCase(s.charAt(i))){
				System.out.println("WA");
				System.exit(0);
			}

		}

		//Arrays.sort(array)
		if(sum!=1) {
			System.out.println("WA");
		}else {
			System.out.println("AC");
		}
	}
}

//Arrays.sort(array, (a, b) -> Integer.compare(a[0], b[0]));