If the kicking is ruled intentional, it is illegally kicking the ball. Kick also changes the impetus, so the result of the play is a touchback - 1st and 10 at A-20 for team A. The penalty for the illegal kick is 10 yards from the basic spot, which would be the previous spot, as the foul occurs during a kick play. As the penalty would place the ball at A-13 and may not result in a first down, team A will obviously decline the penalty.
If the kicking is ruled accidental, see the thread linked in the previous post.