When the expression
\[1-1x+2x^2-2+3x-3x^2+4-4x+5x^2 - 5x + 6x - 7x^2 + 8x - 9\]
is written in the form $ax^2 +bx+c$, where $a$, $b$, and $c$ are non-zero integers, what is the value of $a + b + c$?
