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| import random | |
| print (lambda names, used, assigned: [((lambda n=n: (n, assigned.add(n))[0])(), (lambda p: (p, used.add(p))[0])(next(x for x in (random.choice(list(names - used - {n})) for i in xrange(10**9)) if 1 or len(names - used - {x}) != 1 or (used | {x} != assigned | {n})))) for n in names])(set(raw_input().split(',')), set(), set()) |
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