using System;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace _02._Song_Encryption
{
    class Program
    {
        static void Main(string[] args)
        {
            string commandLine = string.Empty;
            var encryptedArtis = new StringBuilder();
            var encryptedSongs = new StringBuilder();
            while ((commandLine=Console.ReadLine())!= "end")
            {
                string[] currentCommnad = commandLine.Split(":").ToArray();
                string artist = currentCommnad[0];
                string song = currentCommnad[1];
                string pattertForArtist = @"^[A-Z][a-z\s']+$";
                var artistValid = Regex.Match(artist,pattertForArtist);
                string patternForSong = @"^[A-Z\s]+$";
                var songValid = Regex.Match(song, patternForSong);
                if (!songValid.Success||!artistValid.Success)
                {
                    Console.WriteLine($"Invalid input!");
                }
                else
                {
                    Console.Write("Successful encryption: ");
                    for (int i = 0; i < artist.Length; i++)
                    {
                        int key = artist.Length;
                        if (artist[i] == 32)
                        {
                            encryptedArtis.Append(" ");
                        }

                        else if (artist[i] == '\'')
                        {
                            encryptedArtis.Append('\'');
                        }
                        else if ((char)(artist[i]+key)>'z')
                        {
                           int newChar= (artist[i] + key) % 122;
                            encryptedArtis.Append((char)(96+newChar));
                        }
                        else
                        {
                            encryptedArtis.Append((char)(artist[i]+key));
                        }

                    }
                    encryptedArtis.Append("@");
                    for (int i = 0; i < song.Length; i++)
                    {
                        int key = artist.Length;
                        if (song[i] == 32)
                        {
                            encryptedSongs.Append(" ");
                        }

                        else if ((char)(song[i] + key) > 90)
                        {
                            int newChar = (song[i] + key) % 90;
                            encryptedSongs.Append((char)(64 + newChar));
                        }
                        else if((char)(song[i] + key) < 90)
                        {
                            encryptedSongs.Append((char)(song[i] + key));
                        }
                    }
                    Console.Write(encryptedArtis);
                    Console.Write(encryptedSongs);
                    encryptedArtis.Clear();
                    encryptedSongs.Clear();
                    Console.WriteLine();
                }

            }

        }
    }
}