namespace _01.Filter_Extensions
{
    using System;
    using System.Linq;
    using System.IO;

    class FilterExtensions
    {
        public static void Main()
        {
            var extension = Console.ReadLine();

            var folder = Directory.EnumerateFiles("input", $"*.{extension}");

            Console.WriteLine(string.Join("\r\n", folder.Select(x => x.Replace("input\\", ""))));
        }
    }
}