In this task, you are given a string with duplicate characters ocurring in the string. You need to return the character which is ocurring with the maximum frequency. In case of a tie, return the character with the least ascii value.

[EX Q]: ddgggjemkatbymmdjrqqqfeicrcdpzajdotubcgnxivjdkgzqe
[EX A]: d

[EX Q]: rguadowvzfqlktkljtojlzxicbihwzkfktobkxcv
[EX A]: k

[EX Q]: hbzhtwvhyokqvhihgwfhwpogehfoenbbwyqxdmlb
[EX A]:
h