for i in range(len(s)):
if s[0] ==' ':
s=s[1:]
else:
break
if s[-1] ==' ':
s=s[:-2]
return s
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AI__Al
for i in range(len(s)):
if s[0] ==' ':
s=s[1:]
else:
break
for i in range(len(s)):
if s[-1] ==' ':
s=s[:-2]
else:
break
return s