/**

​

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") ➞ " "

​

**/

using System;

using System.Collections.Generic;

using System.Linq;

​

namespace assignment{

public class Program

{

    public static void Main(string txt)

    {

        var str = Console.ReadLine();

        var count = 0;

        var MaxVal = 0;

        List<string> result = new List<string>();

        string answer = new string(str.Distinct().ToArray());

        Console.WriteLine(answer);

            foreach(var j in answer){

                count = str.Count(i => (i==j));

                if(count > MaxVal){

                    MaxVal = count;

                    result.Clear();

                    result.Add(Convert.ToString(j));

                }else if(count == MaxVal){

                    MaxVal = count;

                    result.Add(Convert.ToString(j));

                }

            }   

        if(MaxVal==1){

        Console.WriteLine("No repitition");

        }else{

            result.ForEach(p => Console.WriteLine(p));

        }

    }

}

}