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Given an integer number, find the most frequent digit in it.
- 1998 -> two 9's, one 1, one 8 so return 9
- 177 -> return 7
- 2020 -> there is 2 two's, 2 zero's. Return 2 = the first highest hitter
- 12345 -> all digits occur once, so like the last example return the first digit = 1
Food for thought: how to count things efficiently?
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