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]: tbvxkkmrxrivkpjvrbhboxfyyqlniiobrebtfunsrcq
[EX A]: b

[EX Q]: iufxlomsgolnpdgeqbpwuvedwdfcgwqkebmfgzlanjmc
[EX A]: g

[EX Q]: qcoecneavmzqfykhnlrtsoisbqiqiilxmmwhsodsakcuyefs
[EX A]:
s