using System;

class Program
{
    static void Main()
    {
        Console.Write("Enter a number: ");
        int num = Convert.ToInt32(Console.ReadLine());

        int smallest = 9;

        while (num > 0)
        {
            int digit = num % 10;
            if (digit < smallest)
                smallest = digit;
            num /= 10;
        }

        Console.WriteLine("Smallest digit: " + smallest);
    }
}