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Challenge Points: 20
Level: MediumYou are given two positive integers n and k.
A factor of n is defined as an integer i such that n % i == 0.
Return the kth factor of n (in ascending order).
If n has fewer than k factors, return -1.
Input: n = 12 k = 3
Output: 3
Input: n = 7 k = 2
Output: 7
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