custom charset reality check

[piffdos]

Hi All,

Just wanted to do a reality check after doing a password attack on 3 sha512crypt password hashes for a competition.

I chose to do a dictionary + mask attack because I thought I knew what the password started with (the dictionary) plus 4 numbers followed by a dash -, then 4 uppercase letters.

I set "--custom-charset1=-" the mask was then ?d?d?d?d?1?u?u?u?u

My question is, did my custom charset work? how can I confirm that the hashes that hashcat tested were in fact, what I wanted to test for? Is one character "-" in a custom charset valid?

thanks in advance