This is the 3907th most frequent Russian word.
востока
"Востока" means "of the East" in English.
In this sentence, 'востока' refers to the cardinal direction, east, indicating the place from which the sun rises.
Солнце поднимается с востока.
The sun rises from the east.
Here, 'востока' is used as a modifier to describe 'cultures', referring to cultures from the eastern regions.
Востока культуры включают редкие и красивые традиции.
Eastern cultures include rare and beautiful traditions.
In this usage, 'востока' specifies the origin of the winds, which are coming from the east.