A. Антон и буквы

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yeskendir.sultanov Apr 26, 2024 Never 63

Python 18.py 9 lines (6 loc) | 113 Bytes

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1 s = input()
2  
3 b = set()
4  
5 for x in s:
6     if 'a' <= x and x <= 'z':
7         b.add(x)
8         
9 print(len(b))