#郁闷
def trim(s):
n = len(s)
while s.find(' ') == 0:
s = s[1:]
while s[-1:] == ' ':
s = s[:-1]
return s
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guna我要学爆
#郁闷
def trim(s):
n = len(s)
while s.find(' ') == 0:
s = s[1:]
while s[-1:] == ' ':
s = s[:-1]
return s