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  1. from collections import OrderedDict as O
  2.  
  3. #s=input()
  4.  
  5. f=lambda s:"".join([c*(s.count(c)&-2)for c in O.fromkeys(s)])
  6. print(f("CAB"))
Success #stdin #stdout 0.01s 10248KB
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Python 3 (python  3.9.5)

					

					

						
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7 years ago

					

					

						
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