using System;

public class Program

{

    public static void Main()

    {

        Console.Write("5, 3, 8, 1, 4 ... => Max is: ");

        Console.WriteLine(MaxDigit("5, 3, 8, 1, 4"));

    }

    public static char MaxDigit(string input)

    {

        char maxChar = input[0];

        for (var i = 1; i < input.Length; i++)

        {

            maxChar = maxChar > input[i] ? maxChar : input[i];

        }

        return maxChar;

    }

}