Someone

using System;

class Digits
{
	static bool TwoDigits(int num)
	{
		bool flag = false;

		while ((!flag) && num > 0)
		{
			if ( ((num / 10) % 10) == (num % 10) )
				flag = true;

			num /= 10;
		}

		return flag;
	}

	static void Main()
	{
		int num;

		Console.WriteLine("Enter a number");
		num = int.Parse(Console.ReadLine());

		if (TwoDigits(num))
			Console.WriteLine("=D");
	}
}