User ID Finder

You are given a sorted list of user IDs in ascending order. Your task is to find the position of a specific user ID in this list using binary search. If the ID does not exist, return -1. Input format: - The first line contains an integer n (1 ≤ n ≤ 1000) representing the number of user IDs. - The second line contains n space-separated integers representing the user IDs. - The third line contains an integer representing the user ID you need to search for. Output format: - Print a single integer: the index of the user ID, or -1 if not found. Example: Input: 5 1001 1002 1003 1004 1005 1003 Output: 2