using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    static IEnumerable<string> ModifyArrayMethod(IEnumerable<string> arr) 

    {

        arr = arr.OrderBy(x => x);

        return arr;

    }

    static void PrintArrayMethod(IEnumerable<string> arr) 

    {

        Console.WriteLine(string.Join(", ", arr));

    }

    public static void Main()

    {

        var arr = new string[] { "3", "1", "2"};

        PrintArrayMethod(arr);

        var newArr = ModifyArrayMethod(arr);

        PrintArrayMethod(arr);

        PrintArrayMethod(newArr);

    }

}