How 2 pass level 4 on primate pile up?

1.) First you put the first square to the left of the screen.

2.) Then put the second square to the right of the screen.

Do 1 and 2 until all the squares are gone.

3.) Put the triangle on top of the pile on the right side of the screen.

4.) Then put the reddish monkey on the pile to the left side of the screen.

That should get you to the bananas!!:)