Question

How can i use a combination of at least six numbers letters and punctuation marks

Answer 1

Alphanumeric is a combination of alphabeticand numeric characters, and is used to describe the collection of Latin letters and Arabic digits or a text constructed from this collection.
Merriam-Webster suggests that the term "alphanumeric" may often additionally refer to other symbols, such as punctuation and mathematical symbols.[1]
In the POSIX/C[2] locale, there are either 36 (A-Z+0-9, case insensitive) or 62 (A-Z+a-z+0-9, case-sensitive) alphanumeric characters.