if len(s) == 0:

       return s

   else:

       Num = list(range(len(s)))

       for i in Num:

           if s[i] != ' ':

                first_num = i

                break

           if i == (len(s)-1):

                return ''

       Num.reverse()

       for i in Num:

           if s[i] != ' ':

                last_num = i

                break

       if first_num == last_num:

           return s[first_num]

       else:

           return s[first_num:last_num+1]