If condition based on the values

Hi Team,

Need help with an IF condition formula.

i have a list in coloumn A. The list has numbers like 111, 14523..etc, blanks, and a word like "vacant".

i am looking for an IF condition formula like this - If A2 has a number, the result should be "Ok", If A2 has a word "Vacant", the result should be "Vacant Seat", If A2 is blank, the result should be "Not Ok".

Requesting your kind help.