Coffee Shop Order Management

You are developing a system for a coffee shop to manage customer orders based on their priority. The orders may be of different priority levels (high or low). Implement a program that processes the orders using the following input format: Input: - First line contains an integer n (1 ≤ n ≤ 1000), the number of orders. - The next n lines contain either 'ORDER <priority> <order_id>' or 'SERVE'. <priority> is 'H' for high and 'L' for low. <order_id> is a unique identifier for the order. Output: - Print the order IDs of the served orders in the order they were served. If no orders exist when a SERVE command is encountered, print 'No orders to serve'. Example: Input: 5 ORDER H 101 ORDER L 102 SERVE ORDER H 103 SERVE Output: 101 103