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