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: Wrong Answer)

using System;

namespace ProCon_
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = "";
            input = Console.ReadLine();
            char[] li = new char[input.Length];
            li = input.ToCharArray();
            bool judge = li[0] == 'A' && li[2] == 'C';
            int count_C = 0;
            for (int i = 2; i < input.Length-1; i++)
            {
                if (li[i] == 'C') count_C++;

            }
            if (count_C == 1) judge = true;
            else judge = false;


            li[0] = 'a';
            li[2] = 'c';
            foreach(char c in li)
            {
                judge = judge && !Char.IsUpper(c);
            }


            if (judge)
            {
                Console.WriteLine("AC");
            }
            else Console.WriteLine("WA");

        }
    }
}