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List digits = new List(new int[]{0,1,2,3,4,5,6,7,8,9});

DateTime birthDate = new DateTime(1973, 1, 29);

int index;
while(digits.Count > 0)
{
    index = digits.Count - 1;
    Console.WriteLine(digits[index]);
    digits.RemoveAt(index);
}

string userInput = Console.ReadLine();

Console.WriteLine("userInput={0}", userInput);
Console.WriteLine("birthDate={0}", birthDate);
Console.WriteLine("birthDate compare={0}", DateTime.Compare(birthDate, DateTime.Today));
Console.WriteLine("birthDate diff in seconds={0}", (DateTime.Today - birthDate).TotalSeconds);
Console.WriteLine("Birth Time={0}", DateTime.Parse("1973-01-29 09:30"));
Console.WriteLine("1 Trillion seconds old={0}", (DateTime.Parse("1973-01-29 09:30") + new TimeSpan(0, 0, 1000000000)));
Console.WriteLine("1.5 Trillion seconds old={0}", (DateTime.Parse("1973-01-29 09:30") + new TimeSpan(0, 0, 1500000000)));
Console.WriteLine("2 Trillion seconds old={0}", (DateTime.Parse("1973-01-29 09:30") + new TimeSpan(0, 0, 2000000000)));