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- string = 'aabbcd'
- unique = []
- for char in string[::]:
- if char not in unique:
- unique.append(char)
- print(len(unique))
- import string
- s = 'AabC'
- s = s.lower()
- print(sum(1 for c in string.ascii_lowercase if s.count(c) == 1))
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