def trim(s):
if s=='':
return s
if s[0]==' ':
s=s[1:]
s=trim(s)
elif s[-1]==' ':
s=s[:-1]
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def trim(s):
if s=='':
return s
if s[0]==' ':
s=s[1:]
s=trim(s)
elif s[-1]==' ':
s=s[:-1]
s=trim(s)
return s