using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<string> words=Console.ReadLine().Split(new char[] {' ', ',',';',':','.','(',')','"',',','/','[',']','!','\\','\''}).ToList();

        string word;

        var smaller=new List<string>();

        var upper=new List<string>();

        var mixed=new List<string>();

        bool a=true;

        for(int i=0;i<words.Count;i++)

        {

            word=words[i];

            char[] letters=word.ToCharArray();

            if(letters.IsLower(word[i])==true)

            {

                letters.

            }

        }

    }

}