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.Linq;
using System.IO;
using System.Text;
//var input = Console.ReadLine().Split().Select(int.Parse).ToArray();
namespace AtCoderSolve
{
    class Solve
    {
        const int mod = 1000000007;
        static void Main(string[] args)
        {
            var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
            Console.SetOut(sw);

            string s = Console.ReadLine();
            string ans = "AC";
            if (s[0] != 'A')
            {
                ans = "WA";
            }
            int cnt = 0;
            for(int i = 1; i < s.Length; i++)
            {
                if (i == 1)
                {
                    if (!char.IsLower(s[i])) { ans = "WA"; }
                }
                else if (i >= 2 && i < s.Length - 1)
                {
                    if (s[i]=='C')
                    {
                        cnt++;
                    }
                    else
                    {
                        if (!char.IsLower(s[i]))
                        {
                            ans = "WA";
                        }
                    }
                }
                else { if (!char.IsLower(s[i])) { ans = "WA"; } }
            }
            if (cnt != 1) { ans = "WA"; }

            Console.WriteLine(ans);


            Console.Out.Flush();
        }
    }
    


    public class Calculation
    {

    }

    public class Graph
    {

    }
}