You are given an integer followed by email addresses. Your task is to print a list containing only valid email addresses in lexicographical order.

Valid email addresses must follow these rules:

• It must have the username@websitename.extension format type.
• The username can only contain letters, digits, dashes and underscores .
• The website name can only have letters and digits .
• The extension can only contain letters .
• The maximum length of the extension is .
  
  

Concept

A filter takes a function returning True or False and applies it to a sequence, returning a list of only those members of the sequence where the function returned True. A Lambda function can be used with filters.

Let's say you have to make a list of the squares of integers from to (both included).

>> l = list(range(10))
>> l = list(map(lambda x:x*x, l))

Now, you only require those elements that are greater than but less than .

>> l = list(filter(lambda x: x > 10 and x < 80, l))

Easy, isn't it?

Example

Complete the function fun in the editor below.

fun has the following paramters:

• string s: the string to test

Returns

• boolean: whether the string is a valid email or not