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#!python
#
# Perl Weekly Challenge 247
# Task 2
#
# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-247/>
#
import sys
# task implementation
def main( argv ):
string = argv[ 0 ]
score = {}
for i in range( 0, len( string ) - 1 ):
needle = string[ i ] + string[ i + 1 ]
counting = string.count( needle )
if not counting in score:
score[ counting ] = []
if not needle in score[ counting ]:
score[ counting ].append( needle )
# get the highest key and extract the min value
print( min( score[ max( score.keys() ) ] ) )
# invoke the main without the command itself
if __name__ == '__main__':
main( sys.argv[ 1: ] )
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