Real Inboxes Behind the Addresses

Easy

A mail service receives a list of addresses addresses. Each address is a local name and a domain separated by @. In the **local name** the service applies two rules: - dots . are ignored: a.n.na and anna are the same; - everything from the first + onward is dropped: anna+promo becomes anna. The domain is left untouched. One message was sent to every address. How many distinct inboxes actually receive mail?

Example 1

addresses=["[email protected]", "[email protected]", "[email protected]"] → 2

The first two go to [email protected], the third to [email protected]: different domains, so 2 inboxes.

Example 2

addresses=["[email protected]", "[email protected]"] → 2

Different local names mean different inboxes.

Constraints

1 ≤ len(addresses) ≤ 100
1 ≤ len(addresses[i]) ≤ 100
Addresses consist of lowercase English letters, +, . and exactly one @
Local name and domain are non-empty; the local name does not start with +
The domain ends with .com and has at least one character before it

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Topics

Array Hash Table String

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Input

addresses=["[email protected]", "[email protected]", "[email protected]"]

Expected

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