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#!python
#
# Perl Weekly Challenge 268
# Task 1
#
# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-268>
#
import sys
# task implementation
# the return value will be printed
def task_1( args ):
left = []
right = []
left = list( map( int, args[ 0 : args.index( "|" ) ] ) )
right = list( map( int, args[ args.index( "|" ) + 1 : ] ) )
left.sort()
right.sort()
diffs = []
for index in range( 0, len( left ) ):
d = left[ index ] - right[ index ]
if not d in diffs:
diffs.append( d )
if len( diffs ) == 1:
return diffs[ 0 ]
else:
return None
# invoke the main without the command itself
if __name__ == '__main__':
print( task_1( sys.argv[ 1: ] ) )
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