To practice slicing and using string methods

An email address is a sequence of characters with the following structure:

$$ it contains exactly one @ character

$$ there are $1$ or more characters before the @$.$ We call these characters the username

$$ There is at least one period $(.)$ SOMEWHERE after the @

$$ IMMEDIATELY after the @ there are one or more characters that are NOT periods. We call all the

characters after the @ the fully qualified domain name $($FQD$),$ within the FQD there are zero or more

subdomains separated by periods, a domain before the last$-$period$-$after$-$the$-$@$,$ and a top$-$level do$-$

main $($i$.$e com, ca$,$ etc$)$ after the last period.

For this question, you will write a program that lets the user type in a valid email address, and reports the

username and the top$-$level domain components of that address. Your program may assume that the

user always types a correctly$-$formatted email address. You may also assume all top$-$level domains are no

longer than $3$ characters.

Hint: Tools such as slicing, negative indexing, and the string method $.$find$()$ will probably be the most

useful here.

Sample Runs

Here is one possible sample run. Green text was entered by the user, and the blue text is based on that

input.

Enter email address : ash@pokemon.kanto.jp

Username : ash

First Subdomain $/$ Domain : jp

Here is another one.

Enter email address : jeff.long@usask.ca

Username : jeff.long

First Subdomain $/$ Domain : ca