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;
using System.Collections.Generic;
using System.Text;

namespace AtCoder
{
	public class Program
	{
		// ABC104-B
		static void Main(string[] args)
		{
			string S = Console.ReadLine();
			bool result = true;
			int c = 0;
			for (int i = 0; i < S.Length; i++) {
				if (i == 0) {
					if (S[i] != 'A') {
						result = false;
						break;
					}
				} else if ((2 <= i && i <= S.Length - 2) && S[i] == 'C') {
					c++;
				} else if (S[i] < 'a' || 'z' < S[i]) {
					result = false;
					break;
				}
			}
			if (c != 1) {
				result = false;
			}
			if (result) {
				Console.WriteLine("AC");
			} else {
				Console.WriteLine("WA");
			}
		}
	}
}