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import sys
# task implementation
# the return value will be printed
def task_1( args ):
words1 = []
words2 = []
first = True
for w in args:
if w == '|':
first = False
if first:
words1.append( w )
else:
words2.append( w )
single1 = []
single2 = []
for w in words1:
if len( list( filter( lambda x: x == w, words1 ) ) ) == 1:
if not w in single1:
single1.append( w )
for w in words2:
if len( list( filter( lambda x: x == w, words2 ) ) ) == 1:
if not w in single2:
single2.append( w )
counting = 0
for w in single1:
if w in single2:
counting += 1
return counting
# invoke the main without the command itself
if __name__ == '__main__':
print( task_1( sys.argv[ 1: ] ) )
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