/**

​

Maximum Occurrence

​

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".

​

Example

​

MaxOccur("Computer Science") ➞ "e"

​

MaxOccur("Edabit") ➞ "No Repetition"

​

MaxOccur("system admin") ➞ "m, s"

​

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

​

**/

public class Program

{

    static char mostRepeatingChar(string s)

    {

        int[] count = new int[256];

        int max = 0;

        char result = char.MinValue;

        foreach(char c in  s)

            if(++count[c] > max)

            {

                max = count[c];

                result = c;

            }

        if( max == 1)

        {

            System.Console.WriteLine("No Repitition");

            result = (char)"No Repitition";

        }

        return result;

    }

    public static void Main()

    {

        string text = System.Console.ReadLine();

        System.Console.WriteLine("Maximum occuring character is '{0}'", mostRepeatingChar(text));

    }

}