Can any one please help me. And also explain me step by step .

(6 pts) Suppose that usernames w 0 and 2 digits, and must end with the special character #. usernames, but 34# and SMITH4# a routine for verifying that must start with between 1 and 3 letters, followed by between Thus CA34 and RRS# are valid newly proposed usernames meet the requirements. Formally define ccepts the set of strings that are acceptable usernames. You must ne each member of the 5 tupple (for the transition function list a are not. You are the system administrator and must construct transition table) and draw the FSM