This is the 7074th most frequent Russian word.
бердянска
"Бердянска" refers to Berdyansk, a city in southeastern Ukraine.
Here, 'Бердянске' is used as the locative case form of 'Бердянск', indicating place.
Я был в Бердянске летом.
I was in Berdyansk in the summer.
In this sentence, 'Бердянск' is in the accusative case, indicating motion towards a destination.
Мы едем в Бердянск на выходные.
We are going to Berdyansk for the weekend.
Here, 'Бердянска' is used in the genitive case, to denote belonging or origin.