Problem 1. World Tour

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;
namespace _6
{
    class Program
    {


        static void Main(string[] args)
        {
            string countries = Console.ReadLine();
            while (true)
            {
                string line = Console.ReadLine();
                if (line == "Travel")
                {
                    Console.WriteLine($"Ready for world tour! Planned stops: {countries}");
                    break;
                }
                string[] tokens = line.Split(":");
                switch (tokens[0])
                {
                    case "Switch":
                        {
                            string stringToCheck = tokens[1];
                            string stringToAdd = tokens[2];
                            bool checkIfItContainsChar = countries.Contains(stringToCheck);
                            if (checkIfItContainsChar == true)
                            {
                                string replacement = countries.Replace(stringToCheck, stringToAdd);
                                countries = replacement;
                                Console.WriteLine(countries);
                            }
                            else
                            {

                            }
                            break;
                        }
                    case "Add Stop":
                        {
                            int stringToAddIndex = int.Parse(tokens[1]);
                            string stringToAdd = tokens[2];
                            if (stringToAddIndex <= countries.Length && stringToAddIndex >= 0)
                            {
                                string CutString = countries.Insert(stringToAddIndex, stringToAdd);
                                countries = CutString;
                                Console.WriteLine(countries);
                            }
                            break;
                        }
                    case "Remove Stop":
                        {
                            int stringToCutFirstIndex = int.Parse(tokens[1]);
                            int stringToCutSecondIndex = int.Parse(tokens[2]);

                            if (stringToCutFirstIndex <= countries.Length && stringToCutSecondIndex <= countries.Length && stringToCutSecondIndex >= 0 && stringToCutFirstIndex >= 0)
                            {
                                string CutString = countries.Remove(stringToCutFirstIndex, stringToCutSecondIndex - stringToCutFirstIndex + 1);
                                countries = CutString;
                                Console.WriteLine(countries);
                            }
                            else
                            {

                            }
                            break;
                        }


                }


            }
        }
    }
}