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Find maximum number
Easy Accuracy: 70.2% Submissions: 1205 Points: 2

Given a number N, write a program to find a maximum number that can be formed using all of the digits of this number.
Note: The given number can be very large, so the input is taken as a String.

Example 1:

Input:
N = "38293367"
Output:
98763332
Explanation:
98763332 is the largest number that
can be formed by rearranging the
digits of N.

Example 2:

Input:
N = "1203465"
Output:
6543210
Explanation:
6543210 is the largest number that
can be formed by rearranging the
digits of N.

You don't need to read input or print anything. Your task is to complete the function findMax() which takes a String N as input and returns the answer.

Expected Time Complexity: O(|N|)
Expected Auxiliary Space: O(constant)

Constraints:
1 <= |N| <= 105