Email Validation and Categorization

You are given a list of email addresses separated by spaces. Your task is to write a program that:

• Validates each email address using the following criteria:
• The email should match the regular expression: \( ^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,6}$ \).
• Categorizes valid email addresses by their domain (i.e. the part after the '@' sign) and counts the number of valid emails per domain.
• Prints the list of invalid email addresses first (in the order they appear in the input), followed by a report of valid email counts by domain.

Note: The regular expression above ensures that the top-level domain (TLD) is between 2 to 6 alphabetic characters. Any email address not matching this pattern is considered invalid.

inputFormat

The input consists of a single line containing one or more email addresses separated by spaces.

\(Sample Input:\) user.name@example.com username@com

outputFormat

The output should have two sections:

• The first section titled Invalid Emails: lists each invalid email on a new line. If there are no invalid emails, nothing follows the title.
• The second section titled Valid Email Counts by Domain: lists each valid domain along with the count of valid emails, formatted as domain: count on individual lines.

There should be a blank line between the two sections.

## sample

user.name@example.com username@example.com

Invalid Emails:
Valid Email Counts by Domain:
example.com: 2

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