def trim(s):
for a in range(len(s)):
if s[a]!= ' ':
break
for b in range(len(s)):
if s[b*-1]!= ' ':
return s[a:1+b*-1]
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不晚睡不驼背
def trim(s):
for a in range(len(s)):
if s[a]!= ' ':
break
for b in range(len(s)):
if s[b*-1]!= ' ':
break
return s[a:1+b*-1]