def trim(s):
l = 0
r = len(s)
while l<r:
if s[l] == ' ':
l = l + 1
elif s[r-1] == ' ':
r = r - 1
else :
break
return s[l:r]
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kortion
def trim(s):
l = 0
r = len(s)
while l<r:
if s[l] == ' ':
l = l + 1
elif s[r-1] == ' ':
r = r - 1
else :
break
return s[l:r]