using System;

public class Program

{

    public static void Main()

    {

            string str = "I love to ski in the winter";

            char ch = str[4];

            Console.WriteLine(ch);

​

            int ln = str.Length;

            Console.WriteLine($" Length is {ln}");

​

            Console.WriteLine(str.ToUpper());

            Console.WriteLine(str.ToLower());

​

            int count = 0; 

            for (int i = 0; i < str.Length; i++) 

            { 

                if (str[i] == 'i')

                    count++;

            }

                     Console.WriteLine(count);

            for (int i = 0; i < str.Length; i++)

            {

                char cha = str[i];

                int a = ch;

            }

​

    }

}