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.

[Q]: qrtxfgulbvkhteefsvubsjlobwtfggvfssayhibsn
[A]: s

[Q]: fbvtigigegppmeliewlnamhimlfsggygplrmyxja
[A]: g

[Q]: honbzjfxsmjdljhzmhaxospnrqvxmeosdhxnpogazcnx
[A]:
x