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]: vdsonxdahvsdckbztzqpeftutqfofaonpwwbyvtowhbhptps
[EX A]: t

[EX Q]: eplymvxiqrdpsvllkduyfuqhccgkwxhezwrrxtpjvxcct
[EX A]: c

[EX Q]: zxtukjqmgjjxgcvxvunmimqzffprfiisqqwciaesirjgkghd
[EX A]:
i