import sys
import random
 
users = sys.stdin.readline().split(', ')
print random.choice(users)

aW1wb3J0IHN5cwppbXBvcnQgcmFuZG9tCgp1c2VycyA9IHN5cy5zdGRpbi5yZWFkbGluZSgpLnNwbGl0KCcsICcpCnByaW50IHJhbmRvbS5jaG9pY2UodXNlcnMp

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