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#!python
#
# Perl Weekly Challenge 255
# Task 1
#
# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-254>
#
import sys
# task implementation
# the return value will be printed
def task_1( args ):
origin = args[ 0 ]
shuffled = args[ 1 ]
if len( shuffled ) != len( origin ) + 1:
return "Shuffled string must be one character longer than original string"
classification = {}
for needle in shuffled:
if not needle in classification:
classification[ needle ] = 0
classification[ needle ] += 1
for needle in origin:
classification[ needle ] -= 1
if classification[ needle ] <= 0:
del classification[ needle ]
return list( classification.keys() )[ 0 ]
# invoke the main without the command itself
if __name__ == '__main__':
print( task_1( sys.argv[ 1: ] ) )
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