using System;

public class Program

{

    public static void Main()

    {   // focous on strings

        // functions of it down h

        Console.WriteLine("Hello World".ToUpper());

        string s1 = "ra";

        string s2 = "mohan";

        string s3 = string.Concat(s1,s2);

        // placeholder

        string name = $"My full name is: {s1} {s2}";

        Console.WriteLine(name);

    }

}