Hubbub
------
The Airline of Central Mongolia (ACM) is trying to decide which airport
to choose as their central hub airport.  They wish to place the hub at
the airport that minimizes the maximum direct flying distance from the
hub to any other airport in the world.

You may assume the earth is a perfect sphere.  The radius of the
earth is somewhere between 6000 and 7000 kilometres.  I can't
remember the exact value.
 
Input
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The input file contains several input sets.  Each set consists of a line
containing n <= 1000, the number of airports.  Then, n lines follow, each
giving the latitude (between -90 and +90 degrees) and longitude
(between -180 and +180 degrees) of an airport.  The input floating
point numbers will not have more than two digits after the decimal
point.  Input is terminated by a value of n=0.
 
Output
------
For each input set print the latitude and longitude of the airport
that best serves as a hub in a single line.  If there is more than 
one airport that best serves as a hub print any one of them.

Sample Input
------------
3
3.2 -15.0
20.1 -175
-30.2 10
3
3.2 -15.0
20.1 -175
-30.2 10
0

Sample Output
-------------
3.2 -15
3.2 -15