python3
计算字符个数
http://www.nowcoder.com/questionTerminal/a35ce98431874e3a820dbe4b2d0508b1
def searchTarget(s, target):
s.append(target)
hashmap = {}
res = 0
for i, astr in enumerate(s):
if hashmap.get(ord(target)) is not None:
res += 1
hashmap.pop(ord(target))
hashmap[ord(astr)] = i
return res
s = list(input().lower())
target = input()
print(searchTarget(s, target))
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