final quest

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Threading;

namespace ConsoleApp1
{
    class Exam
    {
        static void Main(string[] args)
        {
            List<string> sentence = Console.ReadLine().Split().ToList();

            string[] command = Console.ReadLine().Split().ToArray();

            while (command[0] != "Stop")
            {
                if (command[0] == "Delete")
                {
                    int index = int.Parse(command[1]) + 1;
                    if (index >= 0 && index < sentence.Count)
                    {
                        sentence.RemoveAt(index);
                    }
                }
                if (command[0] == "Swap")
                {
                    if (sentence.Contains(command[1]) && sentence.Contains(command[2]))
                    {
                        int index1 = sentence.IndexOf(command[1]);
                        int index2 = sentence.IndexOf(command[2]);

                        sentence[index1] = command[2];
                        sentence[index2] = command[1];
                    }
                }
                if (command[0] == "Put")
                {
                    int index = int.Parse(command[2]) - 1;

                    if (index >= 0 && index <= sentence.Count)
                    {
                        sentence.Insert(index, command[1]);
                    }
                }
                if (command[0] == "Sort")
                {
                   //sentence.OrderByDescending(x => x);

                    //sentence.Sort();
                    //sentence.Reverse();

                     sentence.Sort((x, y) => y.CompareTo(x));

                }
                if (command[0] == "Replace")
                {
                    if (sentence.Contains(command[2]))
                    {
                        int index = sentence.IndexOf(command[2]);
                        sentence[index] = command[1];
                    }
                }

                command = Console.ReadLine().Split().ToArray();
            }

            Console.WriteLine(string.Join(" ", sentence));
        }
    }
}