using System;

​

public class Program

{

    public static void Main()

    {

        string word = "AabaBaa";

        word = word.ToLower();

        int len = word.Length - 1;

        int max = 1;

        char maxChar = 'a';

        foreach (char ch in word)

        {

            int count = 0;

            for (int i = 0; i <= len; i++)

            {

                if (ch == word[i])

                {

                    count++;

                    if (count > max)

                    {

                        max = count;

                        maxChar = ch;

                    }

                }

            }

        }

​

        if (max > 1)

        {

            Console.WriteLine("The character  {0}  occurs {1} times.", maxChar, max);

        }

    }

}