using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter a number");

        string str = Console.ReadLine();

        int l = str.Length;

        int i;

        int max = 0;

        char x = '0';

        int j;

        int temp = 0;

        char[] a = str.ToCharArray();

        for(i=0;i<l;i++)

        {

            temp = 0;

            for(j=0;j<l;j++)

            {

                if(i==j)

                {

                    a[i]=a[j];

                }

                else if(a[i]==a[j])

                {

                    temp = temp+1;

                    x=a[i];

                }

            }

            if(temp>max)

            {

                max = temp;

            }

        }

        if(max==0)

        {

            Console.Write("No frequent digit found in the number");

        }

        else

        {

            Console.WriteLine("The most frequent digit is {0}",x);

        }

    }

}