Write a bash script that asks the user for a number and use a case statement to determine if they

What is the command to copy all the $.$doc extension files with file name having only $3$ characters into the directory called $$confi$,$ which is in parent directory.What is the command to copy all the $.$doc extension files with file name having only $3$ characters into the directory called $$confi$,$ which is in parent directory.