using System;

public class Program

{

    public static void Main()

    {

        var expiryYear = 2024;

        var expiryMonth= 1;

        for(var i = 0; i<12; i++){

            Console.WriteLine(new DateTime(expiryYear, expiryMonth, 1).ToString());

            Console.WriteLine(new DateTime(expiryYear, expiryMonth, 1).AddMonths(1).AddDays(-1).ToString());

            expiryMonth++;

        }

    }

}