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;

namespace ABC104_B_AcCepted
{
	internal class Program
	{
		public static void Main(string[] args)
		{
			string s = Console.ReadLine();
			string[] sArr = new string[s.Length];
			

			for (int i = 0; i < s.Length; i++)
			{
				sArr[i] = s.Substring(i, 1);
			}
			
			int countC = 0;
			int appearC = 0;
			bool smallChar = true;
			
			for (int i = 2; i < s.Length - 1; i++) {
				if (sArr[i] == "C")
				{
					countC++;
					appearC = i;
				}
			}

			for (int i = 1; i < s.Length; i++) {
				if (!char.IsLower(sArr[i], 0))
				{
					if (i != 0 && i != appearC)
					{
						smallChar = false;
					}
				}
			}

			if (sArr[0] == "A" && countC == 1 && smallChar) 
			{
				Console.WriteLine("AC");
			}
			else
			{
				Console.WriteLine("WA");
			}
		}
	}
}