one - first	1
two - second	2
four - fourth	4
five - fifth	5
six - sixth	6
seven - seventh	7
eight - eight	8
nine - ninth	9
ten - tenth	10
eleven - eleventh	11
twelve - twelfth	12
thirteen - thirteenth	13
fourteen - fourteenth	14
fifteen - fifteenth	15
sixteen - sixteenth	16
seventeen - seventeenth	17
eighteen - eighteenth	18
nineteen - nineteenth	19
twenty - twentieth	20
twenty-first	21
three - third	3