Add parentheses to the following expression to indicate the order of
evaluation:

    -a*b-c/d**e/f+g**h+1-j/k

Answer: ( ( ( (-(a*b)) - (c/(d**e))/f ) + (g**h) ) + 1 ) - (j/k)
        3 2 1 x      x   y        y   1          2     3