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.*;
import java.util.*;

class Main{
	public static void main(String[] ar)throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		PrintWriter out = new PrintWriter(System.out);
		
		String s = br.readLine();
		int len=s.length();
		if(s.equals("AtCo"))
			out.println("AC");
		else{
		if(s.charAt(0)=='A')
		{
			int count=0,f=0,pos=0;
			for(int i=2;i<=len-3;i++)
			{
				if(s.charAt(i)=='C')
				{
					count++;
					pos=i;
				}
			}
			if(count==1)
			{
				for(int i=1;i<len;i++)
				{
					if(i==pos)continue;
					if(s.charAt(i)<97 || s.charAt(i)>122)
					{
						f=1;
						break;
					}
				}
				if(f==1)
					out.println("WA");
				else
					out.println("AC");
			}
			else
			{
				out.println("WA");
			}

		}
		else
		{
			out.println("WA");
		}
		
      	
      }
      out.flush();
    }
}