Document

Author:Andrew Stankevich   Time limit:2 sec
Input file:document.in   Memory limit:64 Mb
Output file:document.out  

Statement

Andy is fond of old computers. He loves everything about them and he uses emulators of old operating systems on his modern computer. Andy also likes writing programs for them. Recently he has decided to write a text editor for his favorite text-mode operating system.

The most difficult task he has got stuck with is document indexing. An index of the document is the lexicographically ordered list of all words occurring in the document with the numbers of pages they occur at. Andy feels that he is not able to write the component of the editor that performs indexing, so he asks you to help.

A document is a sequence of paragraphs. Each paragraph consists of one or more lines. Paragraphs are separated from each other with exactly one blank line.

First, the document is paginated — divided into pages. Each page consists of up to n lines. Lines are placed on the page one after another, until n lines are placed. The following correction rules are then applied:

After applying the correction rules the next page is formed, and so on until the whole document is paginated.

A word is a continuous sequence of letters of the English alphabet. Case is not important.

The index of the document contains each word from the document and the list of the pages it occurs at. The numbers of pages a word occurs at must be listed in the ascending order. Numbers must be separated by commas. If a word occurs on three or more consecutive pages, only the first and the last page numbers of this range must be listed, separated by a dash, for example 3-5,7-10,12,13,15.

Input file format

The first line of the input file contains n . The rest of the input file contains the document to be indexed.

The line is considered blank if it is completely empty. No line contains leading or trailing spaces. The document does not contain two consecutive blank lines. The first line of the document is not blank.

Output file format

Print all words that occur in the given document. Words must be printed in the lexicographical order, one word on a line. After each word print one space followed by the list of pages it occurs at, formatted as described in problem statement. Use capital letters in output.

Constraints

4 ≤ n ≤ 100. The size of the input file does not exceed 20000 bytes. The length of each line of the document does not exceed 200 characters.

Sample tests

No. Input file (document.in) Output file (document.out)
1
6
From thousands of teams competing in regional 
contests held from September to December 2004 
world-wide, seventy-five teams will advance to 
the World Finals in Shanghai, April 3-7, 2005.  

Awards, prizes, scholarships, and bragging rights 
will be at stake for some of the world's finest 
university students of the computing science.

Join us for the challenge, camaraderie, 
and the fun! Become the best of the best
of the best in ACM ICPC!

ACM ICPC is the best contest!
ACM 3
ADVANCE 1
AND 2,3
APRIL 1
AT 2
AWARDS 2
BE 2
BECOME 3
BEST 3
BRAGGING 2
CAMARADERIE 3
CHALLENGE 3
COMPETING 1
COMPUTING 2
CONTEST 3
CONTESTS 1
DECEMBER 1
FINALS 1
FINEST 2
FIVE 1
FOR 2,3
FROM 1
FUN 3
HELD 1
ICPC 3
IN 1,3
IS 3
JOIN 3
OF 1-3
PRIZES 2
REGIONAL 1
RIGHTS 2
S 2
SCHOLARSHIPS 2
SCIENCE 2
SEPTEMBER 1
SEVENTY 1
SHANGHAI 1
SOME 2
STAKE 2
STUDENTS 2
TEAMS 1
THE 1-3
THOUSANDS 1
TO 1
UNIVERSITY 2
US 3
WIDE 1
WILL 1,2
WORLD 1,2

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