How to redirect URL from Omeka Classic to Omeka S

We have about 250 items in our Omeka Classic library and we migrated them in our new Omeka S library. The old items URL are referenced in a couple of partners website and also on multiple printed ressources and tools. We really need to redirect all of these Omeka Classic URL to their new Omeka S URL. Can someone help us find the best way to do that, knowing that we will have to do 250 manipulations!
Thank you!