在本地输出结果是1，牛客网判定输出结果是2，咋回事？
计算字符个数
http://www.nowcoder.com/questionTerminal/a35ce98431874e3a820dbe4b2d0508b1
import collections
def f(s):
s = dict(collections.Counter(s))
if i in s:
count = s[i]
return count
s = "ABCaD"
i = "a"
print(f(s))
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