You have to design a locker system where people
can deposit their bags of 3 types : small,medium,big.
And there are 3 types of lockers : small,medium,big.
Let's say there are 'n' lockers of each type.
Also, a small bag goes in a small locker,
a big bag in the big locker and so on.
You need to support two operations.
1. deposit a bag
2. retrieve a bag(when the depositor comes back)
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