Trying to restore a wallet using Raven Core. I created the wallet as a paper address and it’s saying I need a seed phrase to recover…but I only have a 51-digit private key

**50-digit

Total private key is 50 characters (I'm literally counting it on paper so bear with me here). I created the wallet on a website, can't remember the name, years and years ago. I did a search of the public key and the coins are there. They haven't been moved. I've downloaded Raven Core to try to recover them, but it's asking for a seed phrase which this wallet generation site never generated, just the multiple letter/digit key. So instead of a seed phrase, it generated a public address and a private address. The private key starts with 5K.

If anyone has any suggestions, please let me know. Otherwise I'm thinking I got screwed generating a wallet on that site. Granted, it was so long ago, I had no clue. Thanks for any assistance.

Edit: Seeing as I have a 5K address, I'm guessing I was attacked by this: https://finance.yahoo.com/news/bad-ravencoin-code-allows-attackers-221633657.html

Makes sense, as the only reason I 'have these coins' is because a miner had reached out to me and told me he'd send me some free coins so I could get used to RVN and start experimenting with it. sigh Oh well.