I have installed MPM, I want to create one password policy that generates fix length passwords with one word before all password

for example, password with length 25 up to 30:

with random generate pass, password will be generated with desirable length. but I can not add one word in that pass word.

generate pass is : lajhdfkljhourslkjfhljsdr#22 

now I want to add one word to this password and change it to : nima@lajhdfkljhourslkjfhljsdr#22 

Or if it's possible that automate password generator add one field from that resource before this pass.

Thanks for more help or guidance