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#!python
#
# Perl Weekly Challenge 280
# Task 1
#
# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-280>
#
import sys
# task implementation
# the return value will be printed
def task_1( args ):
string = args[ 0 ]
for l in string:
if len( list( filter( lambda x: x == l, string ) ) ) > 1:
return l
# invoke the main without the command itself
if __name__ == '__main__':
print( task_1( sys.argv[ 1: ] ) )
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