If the digits represented by $A$ and $B$ satisfy the following subtraction problem
$$ \begin{array}{c@{}c@{\;}c@{}c@{}c@{}c} & & & & A & B_4\\ &- & & & B & A_4\\ &&&&-&-&\\ & & & & & 3_4\\ \end{array} $$
what is the nonnegative difference of the digits represented by $A$ and $B$?
