Arrays & Methods - More Exercises - 02. Manipulate Array

using System;
using System.Linq;

namespace _05b__Arrays_Exercises
{
    class Arrays_Exercises
    {
        static void Main(string[] args)
        {
            string[] arr = Console.ReadLine().Split(' ').ToArray();
            int numCommands = int.Parse(Console.ReadLine());
            string[] commands = new string[numCommands];

            for (int i = 0; i < numCommands; i++)
            {
                commands[i] = Console.ReadLine();

            }

            for (int j = 0; j < numCommands; j++)
            {
                if (commands[j] == "Distinct")
                {
                    arr = arr.Distinct().ToArray();
                }
                if (commands[j] == "Reverse")
                {
                    arr = arr.Reverse().ToArray();
                }
                if (commands[j].Split(' ').First() == "Replace")
                {
                    int replace = int.Parse(commands[j].Split(' ')[1]);
                    arr[replace] = arr[replace].Replace(arr[replace], commands[j].Split(' ')[2]);
                }
            }
            Console.WriteLine(string.Join(", ", arr));
        }
    }
}