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

public class Main {
	
	public static void main(String[] agrs) throws IOException{
		
		InputStreamReader inputStreamReader = new InputStreamReader(System.in);
		BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
		
		String input = bufferedReader.readLine();
		char[] inputArray = input.toCharArray();
		int lengthOfInput = input.length();
				
		char first = inputArray[0];
		boolean condition1 = (first == 'A');
		
		if(!condition1) {
			print("WA");
		}
		
		int numberOfC = 0;
		int cAt = 0;
		boolean condition2 = false;
		
		for (int a = 2; a <= lengthOfInput - 2; a++) {
			if(inputArray[a] == 'C') {
				print(String.valueOf(a));
				
				if(numberOfC == 0) {
					condition2 = true;
					cAt = a;
					
					numberOfC++;
				}else {
					condition2 = false;
					break;
				}
			}
		}
		
		if(!condition2) {
			print("WA");
		}
		
		boolean condition3 = false;
		
		if(condition1 && condition2) {
			for(int a = 0; a < lengthOfInput; a++) {
				if(a != 0 && a != cAt) {
					print(String.valueOf(a));
					
					condition3 = Character.isLowerCase(inputArray[a]);
					if(!condition3) {
						break;
					}
				}
			}
			
			if(!condition3) {
				print("WA");
			}
		}
		
		if(condition1 && condition2 && condition3) {
			print("AC");
		}
	}
	
	public static void print(String string) {
		System.out.println(string);
	}
	
}