using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int[] arrint={20,2022,333,4232,50};

        Dictionary<char,int> occurance= new Dictionary<char,int>();

        //Console.WriteLine("Length of an array: " + arrint.Length);

        for(int i=0; i< arrint.Length; i++)

        {

            char[] temp=arrint[i].ToString().ToCharArray();

            //Console.WriteLine("Length of an char array: " + temp.Length);

            for(int t=0; t< temp.Length; t++)

            {

                if(!occurance.ContainsKey(temp[t]))

                {

                    occurance.Add(temp[t],1);

                }

                else

                {

                    occurance[temp[t]]+= 1;

                }

            }

        }

         Console.WriteLine(occurance.FirstOrDefault(x=> x.Value == occurance.Values.Max()).Key);

    }

}