Find the First Unique URL

You are given a list of URLs. Your task is to find and print the first URL in the list that appears exactly once. The comparison should be case-sensitive (i.e. 'Example.com' and 'example.com' are considered different).

If there is no unique URL, print an empty line.

Note: The first URL with a unique occurrence is defined as the one that, when traversing the list from beginning to end, is encountered only once.

Example:

• Input: ["google.com", "facebook.com", "google.com", "youtube.com", "yahoo.com", "youtube.com", "amazon.com"]
  Output: facebook.com

inputFormat

The input is given from standard input (stdin) and is formatted as follows:

1. An integer n representing the number of URLs.
2. n lines each containing a URL string.

For example:

7
google.com
facebook.com
google.com
youtube.com
yahoo.com
youtube.com
amazon.com

outputFormat

Print the first unique URL to standard output (stdout). If no such URL exists, print an empty line.

## sample

7
google.com
facebook.com
google.com
youtube.com
yahoo.com
youtube.com
amazon.com

facebook.com

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