Welcome. In this kata you are required to, given a string, replace every letter with its position in the alphabet. If anything in the text isn't a letter, ignore it and don't return it. a being 1, b being 2, etc. As an example: string to input: ""The sunset sets at twelve o' clock.". Should return "20 8 5 19 21 14 19 5 20 19 5 20 19 1 20 20 23 5…

solucion1.cs

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

public static class Kata
{
  public static string AlphabetPosition(string text)
  {
  
    //First define the groups:
    var ValidInput = new char[]{ 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
    //Positions in array + 1 = number
   
	   StringBuilder sb = new StringBuilder();
		
	   foreach (var item in text.ToLower().ToCharArray()){
		
		   if(ValidInput.Contains(item)){
		    	sb.Append(Array.IndexOf(ValidInput, item) + 1);
			    sb.Append(" ");
		   }
		
	   }
    return sb.ToString().TrimEnd();;
  }
}

solucion2.cs

using System.Linq;
public static class Kata
{
  public static string AlphabetPosition(string text)
  {
     return string.Join(" ", text.ToLower().Where(char.IsLetter).Select(x => x - 'a'+1));
  }
}