Yan need to recover multiple character password so download SysInspire 7z password recovery software this is recover password 7z file when you forget or lost using by mask attack. This attack help to crack of the password combination like selecting all lower alphabets(a-z), capital alphabets(A-Z), numbers(0-9), special characters(#@^*%), and user-defined characters. this is give you without any cost free demo version use this demo recover first three character.

More info:- https://www.sysinspire.com/7z-password-recovery-software/