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the idea is that since there is nothing else, you cant tell if its a - or a . (because you have nothing to compare to) so by default you need to assume its a .
https://www.codewars.com/kata/5300901726d12b80e8000498
Yours is actually a simpler version of FizzBuzz (so the dificulty should be ajusted)
(btw you can search for keywords in the kata pages to look for puzzles that might be similar to yours or to find more FizzBuzz puzzles)
btw what algorithm is your brute force solution based? (it performs really really well compared with my brute force solution for the previous kata, mine took minutes yours takes 100ms to solve for 1000 trays)
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