MidExam/Group2/Friendlist Maintenance

using System;
using System.Linq;
using System.Collections.Generic;

namespace fundamental14
{
    class MainClass
    {
        public static void Main()
        {

            List<string> friends = Console.ReadLine().Split(", ").ToList();
            string input = string.Empty;


            while ((input = Console.ReadLine()) != "Report")
            {
                string[] array = input.Split();
                string command = array[0];
                if (command == "Blacklist")
                {
                    string name = array[1];
                    if (!friends.Contains(name))
                    {
                        Console.WriteLine($"{name} was not found.");
                    }
                    else
                    {
                        int bla = friends.IndexOf(name);
                        friends.Insert(bla, "Blacklisted");
                        friends.RemoveAt(bla + 1);
                        Console.WriteLine($"{name} was blacklisted.");
                    }
                }
                else if (command == "Error")
                {
                    int index = int.Parse(array[1]);
                    string current = friends[index];
                    if(current != "Blacklisted" && current != "Lost")
                    {
                        friends.Insert(index, "Lost");
                        friends.RemoveAt(index + 1);
                        Console.WriteLine($"{current} was lost due to an error.");
                    }

                }
                else if (command == "Change")
                {
                    int change = int.Parse(array[1]);
                    string newName = array[2];
                    if (change >= 0 && change < friends.Count)
                    {
                        friends.Insert(change, newName);
                        string oldName = friends[change + 1];
                        friends.RemoveAt(change + 1);
                        Console.WriteLine($"{oldName} changed his username to {newName}.");
                    }
                }
            }
            int black = 0;
            int lost = 0;
            for (int i = 0; i < friends.Count; i++)
            {
                if (friends[i] == "Blacklisted")
                {
                    black++;
                }
                if (friends[i] == "Lost")
                {
                    lost++;
                }
            }
            Console.WriteLine($"Blacklisted names: {black}");
            Console.WriteLine($"Lost names: {lost}");
            Console.WriteLine(string.Join(" ", friends));
        }
    }
}