Wagon Loading System

A freight yard is receiving wagons that need to be loaded sequentially into the loading bay. Each wagon has a unique ID and a weight. You must implement a program that loads the wagons into the bay according to their weights: heavier wagons will be loaded last. The program should take N input lines, where the first line contains an integer N (number of wagons), followed by N lines with ID and weight. The output should be the IDs of the wagons in the order they will be loaded. Example Input: 4 W1 4000 W2 2000 W3 3000 W4 1000 Example Output: W4 W2 W3 W1