Password Reset

using System;
using System.Text;

class Program
{
    static void Main()
    {
        string pass = Console.ReadLine();
        string input;
        while ((input = Console.ReadLine()) != "Done")
        {
            string[] cmd = input.Split();
            switch (cmd[0])
            {
                case "TakeOdd":
                    pass = TakeOdd(pass);
                    Console.WriteLine(pass);
                    break;
                case "Cut":
                    pass = Cut(pass, int.Parse(cmd[1]), int.Parse(cmd[2]));
                    Console.WriteLine(pass);
                    break;
                case "Substitute":
                    pass = Substitute(pass, cmd[1], cmd[2]); break;
            }
        }
        Console.WriteLine($"Your password is: {pass}");
    }

    private static string Substitute(string pass, string subString, string replacement)
    {
        if (!pass.Contains(subString))
        {
            Console.WriteLine($"Nothing to replace!");
            return pass;
        }
        string newPass = pass.Replace(subString, replacement);
        Console.WriteLine(newPass);
        return newPass;
    }

    private static string Cut(string pass, int index, int length)
    {
        string subString = pass.Substring(index, length);
        int position = pass.IndexOf(subString);
        return pass.Remove(position, length);
    }

    private static string TakeOdd(string pass)
    {
        StringBuilder newPass = new StringBuilder();
        for (int i = 1; i < pass.Length; i += 2)
            newPass.Append(pass[i]);
        return newPass.ToString();
    }
}