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GIven two positive integers **N **and **K**. You have to find the Kth smallest factor of N. A factor of N is a positive integer which divides N**. **Output the Kth smallest factor of N if it exists otherwise print -1.

**Example 1:**

Input :N =4 ,K =2Output:2Explanation:All factors of 4 are 1,2 and 4. Out of these 2 is the 2nd smallest.

**Example 2:**

Input :N =4 ,K =3Output:4Explanation:All factors of 4 are 1,2 and 4. Out of these 4 is the 3rd smallest.

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **kThSmallestFactor()** which takes 2 Integers N and K as input and returns the answer.

**Expected Time Complexity:** O(sqrt(N))

**Expected Auxiliary Space:** O(1)

**Constraints:**

1 <= N <= 10^{6}

1 <= K <= 10^{6}

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Kth Smallest Factor

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