using System;

using System.Collections.ObjectModel;

public class Program {

    public static void AlterarArray(ReadOnlyCollection<int> input) {

        input[1] = 10;

    }

    public static void Main() {

        int[] teste = new int[] {1, 2, 3, 4, 5};

        AlterarArray(Array.AsReadOnly(teste));

        Console.WriteLine(string.Join('\n', teste));

    }

}