Subwoofer connection help

[Dj G]

I just bought my 1st AV receiver today and was happy till i started connecting the speakers up. I connected up the surround speakers then got to my sub and found that my AV uses a Mono type RCA connection, but my sub is a wire connection like the rest of the speakers. Now this is probably a stupid question, but can i get a connector so i can connect my sub to the receiver.

This will only need to be a temporary thing for a month or two till i can afford a proper sub that did not come with a Home Theater System.