题解 | #下厨房#
下厨房
https://www.nowcoder.com/practice/ca5c9ba9ebac4fd5ae9ba46114b0f476
import sys
def count_food(str1):
uni_food = set()
for i in str1:
uni_food.add(i)
return len(uni_food)
input_data = sys.stdin.read().split()
print(count_food(input_data))
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