Addressing an envelope to a priest!??!?!?!

UHM.... how do I do this??? I feel so dumb right now! I have to send a letter to my priest- we normally call him 'Father Bob'.. thats how its been my whole life- in the letter I addressed him as Father Bob. His name is Robert Schwarz.

I read on a website somewhere that you can put
' Fr. Robert Shwarz' on the envelope.

If anyone has had experience with this and could help me out I'll love you forever lol thanks!

good question i didn't even think of that