// *******************************************************************
//   DigitPlay.java
//
//   Finds the number of digits in a positive integer.
// *******************************************************************
import java.io.*;

public class DigitPlay
{

   public static void main (String[] args) throws IOException
   {

      int num;    //a number

      BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));


      System.out.println ();
      System.out.print ("Please enter a positive integer: ");
      num = Integer.parseInt(keyboard.readLine());

      if (num <= 0)
         System.out.println ( num + " isn't positive -- start over!!");
      else
      {
         // Call numDigits to find the number of digits in the number
         // Print the number returned from numDigits
         System.out.println ("\nThe number " + num + " contains " +
                              + numDigits(num) + " digits.");
          System.out.println ();
      }
   }



   // -----------------------------------------------------------
   //  Recursively counts the digits in a positive integer
   // -----------------------------------------------------------
   public static int numDigits(int num)
   {
      if (num < 10)
         return (1);
      else
         return (1 + numDigits(num/10));
   }

}