A Mars rover is directed to move within a square matrix. It accepts a sequence of commands to move in any of the four directions from each cell:

$[$

UP

$,$

$$

$$

DOWN

$,$

$$LEFT or RIGHT

$)$

$.$

$$

$$

The rover starts from cell

$0$

$.$

$$

$$

and may not move diagonally or outside of the boundary.

Each cell in the matrix has a position equal to:

$($

row size

$)$

$$

$+$

$$

$$

column

where row and column are zero

$-$

indexed, size

$=$

$$

$$

row length of the matrix.

Return the final position of the rover after all moves.

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