using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
           String zbior = "AaBbMmKk";
           String wprowadzono =  Console.ReadLine();

            Console.WriteLine(countOccurences(zbior,wprowadzono));
            Console.WriteLine(meanOfWordLength(wprowadzono));
            foreach ( String word in getWordsThatEndsWith(wprowadzono, ':', "ka")){
               Console.WriteLine(word);
            }

            Console.WriteLine(center(wprowadzono));

            Console.WriteLine(addSpacesAfterSeparators(wprowadzono)v);
        }


        static int countOccurences(String zbior, String input)
        {
            int iloscWystapien = 0;
            foreach (char c in zbior)
            {
                foreach (char c2 in input)
                    if (c == c2)
                        iloscWystapien++;
            }
            return iloscWystapien;
        }

        static int meanOfWordLength(String input)
        {
            int mean = 0;
            String[] words = input.Split(' ');
            foreach (String word in words)
            {
                mean += word.Length;
            }
            return mean/words.Length;
        }

        static List<String> getWordsThatEndsWith(String input, char separator,  String sufix)
        {
            List<String> result = new List<String>();
            foreach (String word in input.Split(separator))
            {
                if (word.EndsWith(sufix))
                    result.Add(word);
            }
            if (!result.Any())
                result.Add("Nie znaleziono");
            return result;
        }

        static String center(String input)
        {
            if (input.Length > 80)
                return input;
            return input.PadLeft(Console.WindowWidth / 2);
        }

        static String addSpacesAfterSeparators(String input)
        {
            input = input.Replace(". ", ".");
            input = input.Replace(", ", ",");

            input = input.Replace(".", ". ");
            input = input.Replace(",", ", ");
            return input;
        }
    }
}