Substring

using System;

public class Substring_broken
{
    public static void Main()
    {
        string text = Console.ReadLine();
        string result = string.Empty;
        int jump = int.Parse(Console.ReadLine());
        int symbol = 112;
        bool hasMatch = false;
        for (int i = 0; i < text.Length; i++)
        {
            int step = jump;
            if (text[i] == symbol)
            {
                hasMatch = true;
                while (true)
                {
                    try
                    {
                        result = text.Substring(i, step+ 1);
                        i += jump;
                        Console.WriteLine(result);
                        break;
                    }
                    catch (Exception ex)
                    {
                        step--;
                    }
                }
            }
        }
        if (!hasMatch)
        {
            Console.WriteLine("no");
        }
    }
}