using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        foreach (var i in e(new DateTime(2050,2,5),new DateTime(2060,12,12)))

        {

            //Console.Write($"{i:dd/MM/yyyy} ");

        }

        Console.WriteLine();

        //h2(new DateTime(2050,2,5),new DateTime(2060,12,12));

        Console.WriteLine();

​

        Console.WriteLine(f(new DateTime(2050,2,5),new DateTime(2060,12,12)));

    }

    static IEnumerable<DateTime> e(DateTime a, DateTime b)

    {

        for(;a<b;a=a.AddDays(1))if($"{a:yyy}"==string.Concat(($"{a:ddMM}").Reverse()))yield return a;

    }

    static void h2(DateTime c, DateTime d)

    {

        Action<DateTime, DateTime> action=

            (a,b)=>{for(;a<b;a=a.AddDays(1))if($"{a:yyy}"==string.Concat(($"{a:ddMM}").Reverse()))a.Dump();};

        action(c,d);

    }

    static string f(DateTime a, DateTime b)

    {

        var r="";for(;a<b;a=a.AddDays(1))if($"{a:yyy}"==string.Concat(($"{a:ddMM}").Reverse()))r+=a+",";return r;

    }

}