CubicMessages100

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace _4.CubicMessages
{
    class CubicMessages
    {
        static void Main()
        {
            string code = Console.ReadLine();
            StringBuilder builder = new StringBuilder();

            while (!code.Equals("Over!"))
            {
                int decryptorSize = int.Parse(Console.ReadLine());
                Regex check = new Regex(@"^(\d+)([a-zA-Z]+)([^a-zA-Z]*)$");

                if (check.Match(code).Success && check.Match(code).Groups[2].Length == decryptorSize)
                {
                    Match matches = check.Match(code);
                    string val = matches.Groups[1].Value;
                    for (int i = 0; i < val.Length; i++)
                    {
                        if (int.Parse(val[i] + "") >= 0 && int.Parse(val[i] + "") < decryptorSize)
                        {
                            builder.Append(matches.Groups[2].Value[int.Parse(val[i] + "")]);
                        }
                        else
                        {
                            builder.Append(" ");
                        }
                    }
                    string val2 = matches.Groups[3].Value;
                    int[] nums = getVal2(val2);
                    for (int i = 0; i < val2.Length; i++)
                    {
                        if (nums[i] >= 0 && nums[i] < decryptorSize)
                        {
                            builder.Append(matches.Groups[2].Value[nums[i]].ToString());
                        }
                        else
                        {
                            builder.Append(" ");
                        }
                    }
                    Console.WriteLine("{0} == {1}", matches.Groups[2].Value,builder.ToString());
                }
                code = Console.ReadLine();
                builder = new StringBuilder();
            }
        }

        private static int[] getVal2(string val2)
        {
            char[] a = val2.ToCharArray();
            int[] b = new int[a.Length];
            for (int i = 0; i < a.Length; i++)
            {
                if (char.IsDigit(a[i]))
                {
                    b[i] = int.Parse(a[i] + "");
                }
                else
                {
                    b[i] = -1;
                }
            }
            return b;
        }
    }
}