while 1:
if s[:1]==' ':
s=s[1:]
else:
break
if s[-1:]==' ':
s=s[:-1]
return s
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达米力乌
while 1:
if s[:1]==' ':
s=s[1:]
else:
break
while 1:
if s[-1:]==' ':
s=s[:-1]
else:
break
return s