using System;

​

public class Program

{

    public static void Main(string[] args)

    {

        Print("123");

        Print(123);

    }

​

    static void Print(object obj)

    {

        if (obj is null)

            return;

        if (obj is string s)

        {

            Console.WriteLine($"{s.Length}");

        }       

        else

        {

            Console.WriteLine(obj.ToString());

        }

​

    }

}