Warehouse Inventory System Simulation

You are given a warehouse inventory system simulation task. The system processes a series of operations of two kinds:

• LOAD: Adds a specified quantity of an item to the inventory.
• UNLOAD: Removes a specified quantity of an item from the inventory. If the item does not exist or its quantity is insufficient, the system should report an error by outputting the message "Insufficient items".

The input is provided via standard input: The first line contains an integer \(n\) denoting the number of operations. Then, \(n\) lines follow, each representing an operation in the format COMMAND item quantity (for example, LOAD apple 100 or UNLOAD apple 50).

Your task is to simulate the inventory operations. For each unsuccessful UNLOAD operation (i.e. when an attempt is made to unload more items than available or when the item is not in inventory), output the message "Insufficient items" on a separate line. If there are no such errors, output nothing.

Note: Ensure you read from standard input (stdin) and write your output to standard output (stdout).

inputFormat

The first line of input contains a single integer \(n\) representing the number of operations. The following \(n\) lines each contain one operation in the format:

COMMAND item quantity

Where COMMAND is either LOAD or UNLOAD, item is a string representing the item name, and quantity is a positive integer.

outputFormat

For each UNLOAD operation that fails (either due to the item not existing in the inventory or insufficient quantity), print Insufficient items on a separate line. If no operations fail, output nothing.

## sample

3
LOAD apple 100
LOAD banana 150
LOAD apple 50