Hackerrank Challenge | Challenge #63 | Set Mutations

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Can you please explain this: "a" value is len(setA), and then a number of elements in the "setA" is restricted to "a" value. But from the code in your video, I can't find a condition that is saying: User has set up "a" to value 16, number of elements allowed to enter in the "setA" has to be 16. So how those 2 lines of code ( "a" and "setA" ) are connected?

Marko