/*
StreamTokenizer and getting number-length example
Copyright (C) 2009  Vegard Hammerseth <vegard@hammerseth.com> (http://vegard.hammerseth.com)

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

v1.0.0
*/

import java.io.StreamTokenizer;
import java.io.InputStreamReader;
import java.io.BufferedReader;
class numberDigits
{
    public static void main(String[] args) throws Exception
    {
        double num = -1;
	StreamTokenizer st = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
        System.out.println("Write a number:");
        while (true)
        {
            while (st.nextToken() != StreamTokenizer.TT_NUMBER)
            {
                System.out.println("Invalid number.\nWrite a number:");
                continue;
            }
            num = st.nval;
            if (num < 0 || num > 999)
            {
                System.out.println("Number must be between 0 and 999.\nTry again:");
                continue;
            }
            break;
        }
		
	/* convert int to string to find length */
        String digit = String.valueOf(num);
		
        System.out.println(digit.length()-2 + " digit(s).");
    }
}