n=1
k=-1
d=len(s)
while s[:n] == ' ':
n=n+1
s=s[n:d]
while s[k:] == ' ':
k=k-1
s=s[:k]
return s
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宽人宽语
n=1
k=-1
d=len(s)
while s[:n] == ' ':
n=n+1
s=s[n:d]
while s[k:] == ' ':
k=k-1
s=s[:k]
return s