Find the most frequent digit
Easy Accuracy: 49.18% Submissions: 407 Points: 2

Given a number N, find the most occurring digit in it. If two or more digits occur same number of times, then return the highest of them. Input number is given as a string.

Example 1:

Input:
N = "12234"
Output:
2
Explanation :
2 occurs most times

Example 2:

Input:
N = "1122"
Output:
2
Explanation :
1 and 2 occurs most times but 2 > 1.

 

Your Task:

You don't need to read input or print anything. Your task is to complete the function solve() that receives a string N as input parameter and returns the most frequent digit in it as a string.

Expected Time Complexity : O(len(N))
Expected Space Complexity : O(1)

Constraints:
1<= len(N) <=101000

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