Identify Duplicated Usernames

You are tasked with finding duplicate usernames from a list of names. Each username is a string, and you need to determine how many usernames are duplicated in the list. Input format: - The first line contains an integer N (1 ≤ N ≤ 1000), the number of usernames. - The next N lines each contain a string, the username. Output format: - A single integer representing the count of duplicated usernames. Example Input: 5 user1 user2 user1 user3 user2 Example Output: 2