Duplicate Removal
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The company Al's Chocolate Mangos has a web site where visitors can guess how many chocolate 
covered mangos are in a virtual jar.  Visitors type in a guess between 1 and 99 and then 
click on a "Submit" button.  Unfortunately, the response time from the server is often long, 
and visitors get impatient and click "Submit" several times in a row.  This generates many 
duplicate requests.  Your task is to write a program to assist the staff at ACM in filtering 
out these duplicate requests.

Input
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The input consists of a series of lines, one for each web session.  The first integer on a 
line is N, 0 < N <= 25, which is the number of guesses on this line.  These guesses are all 
between 1 and 99, inclusive. The value N = 0 indicates the end of all the input.

Output
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For each input data set, output a single line with the guesses in the original order, but 
with consecutive duplicates removed.  Conclude each output line with the dollar sign 
character '$'.  Note that there is a single space between the last integer and the dollar sign.

Sample Input
------------
5 1 22 22 22 3
4 98 76 20 76
6 19 19 35 86 86 86
1 7
0

Sample Output
-------------
1 22 3 $
98 76 20 76 $
19 35 86 $
7 $