for s1 in s:
if s1!=" ":
break
s=s[1:]
for s2 in s[::-1]:
if s2!=" ":
s=s[:-1]
return s
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一度剑心
for s1 in s:
if s1!=" ":
break
s=s[1:]
for s2 in s[::-1]:
if s2!=" ":
break
s=s[:-1]
return s