[C#-2.1.12] LettersIndex

using System;

class LettersIndex
{

    static void Main()
    {
        char[] alphabet = new char[26];
        for (int i = 0; i < 26; i++)
        {
            alphabet[i] = (char)(i + 97);
        }

        bool check = true;

        while (check)
        {
            char letter = Convert.ToChar(Console.Read());
            if (letter == '\r' || letter == '\n' )
            {
                check = false;
                break;
            }
            for (int i = 0; i < alphabet.Length; i++)
            {
                if (letter == alphabet[i])
                {
                    Console.Write(i+1 + " ");
                    break;
                }
            }
        }
    }
}