题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
from itertools import count
def count_chars(str_input):
return len(set(str_input))
if __name__ == '__main__':
str_input = input()
print(count_chars(str_input))
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