What is the difference between a 1-R and 1-S in jeans size?

It is my first time purchasing Hollister from the website (my first time purchasing Hollister period, actually), and I am unsure whether to purchase a size 1-R or a size 1-S. I am aware that the letters refer to the length, but I am not aware of the lengths of either sizes. I am 5' tall. Which size would suit my height?