题解 | #字符个数统计#
字符个数统计
http://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
很简单，算不算中等题：
s=input()
list1=[]
for i in s:
if i not in list1:
list1.append(i)
print(len(list1))
list1=[]
for i in s:
if i not in list1:
list1.append(i)
print(len(list1))
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