/******************************************************************************
 * This program converts input stream of bytes to hexadecimal.
 * 
 * Copyright © 2020 Richard Lesh.  All rights reserved.
 *****************************************************************************/

import org.pureprogrammer.Utils;

public class HexadecimalFilterByteCount {

    public static void main(String[] args) {
        int c;
        String hex;
        int count = 0;
        while ((c = Utils.getbyte(System.in)) != -1) {
            if (count % 16 == 0) {
                System.out.print(Utils.format("{0:06x}:", count));
            }
            ++count;
            hex = Utils.format(" {0:02x}", c);
            System.out.print(hex);
            if (count % 16 == 0) {
                System.out.println();
            }
        }
    }
}