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Given a number n, find the smallest number that has same set of digits as n and is greater than n. If n is the greatest possible number with its set of digits, report it.

**Example 1:**

**Input:**
N = 143
**Output:** 314
**Explanation**: Numbers possible with digits
1, 3 and 4 are: 134, **143**, **314**, 341, 413, 431.
The first greater number after 143 is 314.

â€‹**Example 2:**

**Input**:
N = 431
**Output:** not possible
**Explanation**: Numbers possible with digits
1, 3 and 4 are: 134, 143, 314, 341, 413, 431.
Clearly, there's no number greater than 431.

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **findNext () **which takes an integer N as input and returns the smallest number greater than N with the same set of digits as N. If such a number is not possible, return -1.

**Expected Time Complexity: **O(LogN).

**Expected Auxiliary Space: **O(LogN).

**Constraints:**

1 ≤ N ≤ 100000

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Next greater number set digits

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