How can I open the garage?

The garage door is locked. It looks that a code composed by 10 letters is requiered to open it.

There is a book on the floor, with a post-it inside. May it be useful to open the door? Will you need some help from your partners?

On the back of the paper, there are the numbers from 1 to 10 (ordered).

Example: if the numbers go from 1 to 3, and their colors are white, black and yellow; the code would be wby.

Note: The numbers go from 1 to 10, each of them has a color. Write down the correct color sequence.