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- st = input()
- res_set = set()
- to_be_deleted = []
- for ch in st:
- if not ch in res_set:
- res_set.add(ch)
- else:
- to_be_deleted.append(ch)
- for item in to_be_deleted:
- res_set.discard(item)
- print(''.join(list(sorted(res_set))))
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