using System;

public class Program

{

    public static void Main()

    {

        int i=0,count=0;

        string str1="";

        Console.WriteLine("Enter a string");

        string str = Console.ReadLine();

        Console.WriteLine("Enter the substring number");

        int substr=Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Enter the number of characters");

        int n=Convert.ToInt32(Console.ReadLine());

        for(i=substr;i<=(str.Length)-1;i++)

            count=count+1;

        Console.WriteLine(count);

        if(count<n)

            Console.WriteLine("Number of characters should not larger than remaining string length");

        else

        {

        for(i=substr; i<=n+1; i++)

        {

            str1=str1+str[i];

        }

        }

        Console.WriteLine(str1);

    }

}