Classify these words according to the pronunciation of their final S:
cars-buses-trains-planes-stops-watches-mosques-screens-teachers-hands-steps-spots-schools-programmes-cheats-frauds-windows-students-wages-garages-boys-smiles-lighters-sead-oceans-houses-roses-helps-carts-bords-countries-jokes-visits-balls-cages-milks-cows-animals-hats-bills-glasses-vases-faces-judges-courts-bottons-cats-matches-stones-girls-keys-dictionaries-receives-guitarists-cartoons-heats-freezes
cars-buses-trains-planes-stops-watches-mosques-screens-teachers-hands-steps-spots-schools-programmes-cheats-frauds-windows-students-wages-garages-boys-smiles-lighters-sead-oceans-houses-roses-helps-carts-bords-countries-jokes-visits-balls-cages-milks-cows-animals-hats-bills-glasses-vases-faces-judges-courts-bottons-cats-matches-stones-girls-keys-dictionaries-receives-guitarists-cartoons-heats-freezes