using System;

public class Program

{

    public static void Main()

    {

        string str1 = "Foundations of Computer Science I", str2 = "spring 2020", str3 = "";

        int index = -1;

        bool result;

        result = (str2.Contains("ring"));

        Console.WriteLine(result);

        str3 = str2.Remove(0,7);

        Console.WriteLine(str3);

        index = str2.LastIndexOf("20");

        Console.WriteLine(index);

        char delim = (' ');

        string[]tokens = str1.Split(delim);

        foreach(string q in tokens)

        {

            Console.WriteLine(q);

        }

    }

}