n=len(s)
if s==" "*n:
s=''
else:
while s[0]==' ':
s=s[1:]
while s[-1]==' ':
s=s[:-1]
return s
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不忈嫑脸
n=len(s)
if s==" "*n:
s=''
else:
while s[0]==' ':
s=s[1:]
while s[-1]==' ':
s=s[:-1]
return s