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作业

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#1 Created at ... [Delete] [Delete and Lock User] 
k = 0
l = len(s) - 1
while k <= l :
  if s[k] == ' ':
     k += 1
  else:
     break

while l > 0:
  if s[l] == ' ':
     l = l - 1
  else:
     break

return(s[k:l+1])
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