[C#] Домашно Arrays - 12 Задача

/* Write a program that creates an array containing
 * all letters from the alphabet (A-Z). Read a word
 * from the console and print the index of each of its letters in the array.
 */

using System;

class LetterIndex
{
    static void Main()
    {
        int[] letterIndexes = new int[53];
        //lowercase
        for (int i = 1; i < letterIndexes.Length / 2 + 1; i++)
        {
            letterIndexes[i] = ('a' - 1) + i;
        }
        //Upercase
        for (int i = letterIndexes.Length / 2 + 1, k = 0; i < letterIndexes.Length; i++, k++)
        {
            letterIndexes[i] = 'A' + k;
        }

        //Letter check
        Console.Write("enter word : ");
        string testWord = (Console.ReadLine());

        for (int i = 0; i < testWord.Length; i++)
        {
            for (int j = 0; j < letterIndexes.Length; j++)
            {
                if (testWord[i] == letterIndexes[j])
                {
                    Console.WriteLine("Leter {0} has index: {1}", testWord[i], j);
                    break;
                }
            }
        }
    }
}