What is the horizontal net force in this Physics problem?

Two ice-hockey players simultaneously strike a puck with their sticks. The stick of one player exerts an eastward force on the puck of 15N. The other player's stick exerts a northward force of 11N on the puck. uming that there is no frictional force between the puck and the ice, what is the magnitude of the net horizontal force on the puck?