Write the Compass sprite configuration that assembles a sprite sheet by placing each image in the "ui" sprite map where it best fits.

Write the Compass sprite configuration that assembles a sprite sheet by placing each image in the "ui" sprite map where it best fits. 

The answer for this is 

$ui-layout: smart;

What can catch you out here from the examples is the UI value ; which was ICONS in the video example will need to change depending on the map/folder being used.