using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace Examples111

{

    class Program

    {

        static void Main(string[] args)

        {

            var input = Console.ReadLine().Split(new char[] { ',', ';', ':', '.', '!', '(', ')', '"', '/', '[', ']', ' ' }).ToList();

            var lower = new List<string>();

            var mixed = new List<string>();

            var upper = new List<string>();

            var a = false;

            var b = false;

            foreach (var ele in input)

            {

                foreach (var ch in ele)

                {

                    if (Char.IsLower(ch) == true)

                        a = true;

                    if (Char.IsUpper(ch) == true)

                        b = true;

                }

                if (a == true)

                {

                    if (b == true)

                        mixed.Add(ele);

                    else lower.Add(ele);

                }

                else upper.Add(ele);

                a = false;

                b = false;

            }

            Console.WriteLine($"Lower-case: {String.Join(", ", lower)}");

            Console.WriteLine($"Mixed-case: {String.Join(", ", mixed)}");

            Console.WriteLine($"Upper-case: {String.Join(", ", upper)}");

        }

    }

}

​