write a program to implement an inventory tracking system for a robot retail store. Given a transaction log 'logs' where each log item corresponds to one of three transaction types 'supply', 'sell', or 'upgrade'. Log items are generated in the following format $["$supply$",","",""].$ The store receives units of and each costs $.["$sell$","",""].$ The store sells units of $.$ If the robot is available at different prices, the store is guaranteed to have enough robots for all transactions. $["$upgrade$",","","",""]$ the store upgrades units of to a new price