题解 | #字符个数统计#
字符个数统计
http://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
使用ascil码做标记，对比ascil码即可
str1 = str(input())
asc = []
k = 0
for i in str1:
flag = 0
for j in asc:
if ord(i) == j:
flag = 1
if flag == 0:
asc.append(ord(i))
k += 1
print(k)
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