Ask Customs Chracter Set

How do I set the character as you wish. I remember the password begins with a 141-xxxxxxxxxx and I do not know what x was. If I am looking for a 14 character it will take a long time.

Is it possible to set a character in a brute-force without having to 14 characters, so only the 10 characters behind that?

So custom like 141-? |? |? |? |? |? |? |? | What's the solution?

Or use the rules? its hash using SHA256

Thank you