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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;


public class B{
	
	public static void Main(){
	
		string str = Console.ReadLine();
		
		bool result = true;
		int cIndex = str.IndexOf("C");
		if( cIndex < 2 || cIndex > str.Length - 2 || str[0] != 'A' ){
			result = false;
			
		}else{
			for( int i = 1; i < str.Length; i++ ){
				if( char.IsUpper(str[i]) ){
					if( i != cIndex ){
						result = false;
						break;
					}
				}
			}
			
		}
		
		Console.WriteLine( result ? "AC" : "WA" );
		
	}

}