$0 = 1
$1 = H * W
$21 = 0
$22 = 0

while($0 <= $1)
  $2 = $0 - 1
  $3 = $2 / W
  $4 = $3 + 1

  $5 = $2 % W
  $6 = $5 + 1

  $7 = A[$4, $6]
  $8 = B[$4, $6]

  $12 = $7 - $8
  $21 = $4 * ($12 != 0)
  $22 = $6 * ($12 != 0)

  $0 = $0 + 1
end

return ($21, $22)