How can I update Contacts so that their owner matches the Account Owner

How can I update Contacts so that their owner matches the Account Owner

This is probably really simple but i'm pretty new to Zoho and this has stumped me...

I want every contact to be owned by the same member of staff as the account owner - currently I have exceptions to this that I want to remove.

There must be a simple way to do this without exporting the data amending it in excel and re-importing it but I can't seem to figure it out.

Thanks,

Ben