Unique Email Addresses

In many email services, the local part of an email address can be modified without affecting delivery. In this problem, you are given a list of email addresses and you must compute the number of unique addresses after normalization.

The normalization process for each email is as follows:

• Split the email into a local part and a domain part using the '@' symbol.
• In the local part, ignore all characters after a plus ('+') sign (if any).
• Remove all the dot ('.') characters from the local part.
• Concatenate the processed local part with the domain part.

For example, the email test.email+alex@leetcode.com is normalized to testemail@leetcode.com.

inputFormat

The first line contains an integer (n) representing the number of email addresses. Each of the following (n) lines contains a single email address.

outputFormat

Output a single integer that denotes the number of unique email addresses after normalization.## sample

3
test.email+alex@leetcode.com
test.e.mail+bob.cathy@leetcode.com
testemail+david@lee.tcode.com

2