$A$] to the opposite corner [point $B$]. However she wants do this in a way such that she has to cross the shortest distance possible. If the length of the sides of the cube is $1$, the shortest distance between $A$ and $B$ can be expressed as $p+\sqrt{q}$ where $p$ and $q$ are non-negative integers and $q$ is square-free. What is $q-p$?

Brilli the ant is trapped on a cube-shaped planet. She wants to go from one corner [point**Details and assumptions**:

Brilli the ant is completely confined to the surface of the cube. She can't move inside or outside the cube.

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