1084 - Booklet Printing

Time limit : 1 sMemory limit : 32 mb
Submitted : 930Accepted : 431

Problem Description

When printing out a document, normally the first page is printed first, then the second, then the third, and so on until the end. However, when creating a fold-over booklet, the order of printing must be altered. A fold-over booklet has four pages per sheet, with two on the front and two on the back. When you stack all the sheets in order, then fold the booklet in half, the pages appear in the correct order as in a regular book.

For example, a 4-page booklet would print on 1 sheet of paper: the front will contain page 4 then page 1, and the back will contain page 2 then page 3.

Front          Back
-------------  -------------
|     |     |  |     |     |
|  4 |  1  |  |  2 |  3 |
|     |     |  |     |     |
-------------  -------------

Your task is to write a program that takes as input the number of pages to be printed, then generates the printing order.

Input


Each test case consists of a positive integer n on a line by itself, where n is the number of pages to be printed; n will not exceed 100.

Output


Output must be in ascending order by sheet, front first, then back.

Sample Input

1
14
4
0

Sample Output


Printing order for 1 pages:
Sheet 1, front: Blank, 1
Printing order for 14 pages:
Sheet 1, front: Blank, 1
Sheet 1, back : 2, Blank
Sheet 2, front: 14, 3
Sheet 2, back : 4, 13
Sheet 3, front: 12, 5
Sheet 3, back : 6, 11
Sheet 4, front: 10, 7
Sheet 4, back : 8, 9
Printing order for 4 pages:
Sheet 1, front: 4, 1
Sheet 1, back : 2, 3


Hint

Source