Problem B - Equating Equations
                                       
   Read (incorrect) equations with up to 16 terms and + and - operators
   and reorder the terms (but not the operators) so that the equations
   hold. For example

   1 + 2 = 4 - 5 + 6

   is not a correct equation but the terms can be rearranged thus so it
   is:

   6 + 2 = 4 - 1 + 5

   Standard input consists of several pseudo-equations, one per line.
   Each pseudo-equation has up to 16 integer terms. Adjacent terms are
   separated by one operator, and spaces may appear surrounding the
   terms. There is exactly one = operator in the equation.
   
   Your output will consist of one line per input line, with the same
   operators and the same terms. The order of the operators must be
   preserved, but the terms must be reordered so the equation holds. Any
   ordering such that the equation holds is correct. If no ordering
   exists, a line containing

   no solution

   should be printed. One space should appear on either side of each
   operator and there should be no other spaces.
   
Sample Input

1 + 2 = 4 - 5 + 6
111 + 222 = 444 - 555 + 665

Output for Sample Input

6 + 2 = 4 - 1 + 5
no solution