Given a string text. Write a function that returns the character with the highest frequency. If more than 1 character has the same highest frequency, return all those characters as a comma separated string. If there is no repetition in characters, return "No Repetition".

Examples

maxOccur("Computer Science") ➞ "e"

maxOccur("Edabit") ➞ "No Repetition"

maxOccur("system admin") ➞ "m, s"

maxOccur("the quick brown fox jumps over the lazy dog") ➞ " "

Notes

Characters are case sensitive, so, for example, "C" and "c" are counted separately