1.first(1st)

2.second(2nd)

3.third(3rd)

4.fourth(4th)

5.fifth(5th)

6.sixth(6th)

7.seventh(7th)

8.eighth(8th)

9.ninth(9th)

10.tenth(10th)

11.eleventh(11th)

12.twelfth(12th)

13.thirteenth(13th)

14.fourteenth(14th)

15.fifteenth(15th)

16.sixteenth(16th)

17.seventeenth(17th)

18.eighteenth(18th)

19.nineteenth(19th)

20.twentieth(20th)