using System;

public class Program

{

    public static void Main(string[]args)

    {

        Console.WriteLine("Pros and cons of online learning");

         Console.WriteLine("Pros:");

          Console.WriteLine(" 1.Online classes that can be taken at home have brought a lot of convenience to teachers and students. For example, there is no need to wear school uniforms, no need to go back and forth between home and school, and there are learning materials at any time, so that students can learn at any time.");

          Console.WriteLine(" 2.Don't need to worry about not being able to hear the teacher clearly or remember important content like in face-to-face class - after all, most of the content and resources can be found on the website.");

          Console.WriteLine(" 3.You can see your grades immediately after the exam or the assignment, and you can also see your grades in advance after the semester is over.");

          Console.WriteLine(" 4.Online learning reduces the cost of paper, equipment, etc. This means less money and more environmentally friendly.");

         Console.WriteLine("Cons");

          Console.WriteLine(" 1.If you have a question you want to ask the teacher or have a problem that needs to be solved, you may not receive a reply immediately.");

          Console.WriteLine(" 2.Stay away from face-to-face communication, you may feel bored, lonely, and even depressed.");

          Console.WriteLine(" 3.For some courses, students cannot participate in activities, such as physical education classes cannot be trained in stadiums, religious classes cannot visit churches, synagogues, Buddhist temples, etc. This reduces the students' sense of learning experience and reduces opportunities for social activities.");

          Console.WriteLine(" 4.An immature online course system may cause students and teachers to encounter some technical problems.");

          Console.WriteLine(" 5.Watching electronic products for a long time can also cause damage to the eyes, spine and other body parts.");

    }

}