Mentor Group

using System;
using System.Collections.Generic;
using System.Linq;
using System.Globalization;

namespace Prob_08_Mentor_Group
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            List<Mentor> Mentors = new List<Mentor>();
            List<string> MentorsName = new List<string>();
            List<Coment> Coments = new List<Coment>();


            InputMentors(Mentors, MentorsName);
            InputComents(MentorsName, Coments);
            Output(Mentors, MentorsName, Coments);
        }

        static void Output(List<Mentor> Mentors, List<string> MentorsName, List<Coment> Coments)
        {
            foreach (var mentorName in MentorsName)
            {
                Console.WriteLine("{0}", mentorName);
                Console.WriteLine("Comments:");
                foreach (var coment in Coments.Where(a => a.MentorName == mentorName))
                {
                    Console.WriteLine("- {0}", coment.ComentText);
                }
                Console.WriteLine("Dates attended:");
                foreach (var mentor in Mentors.Where(a => a.Name == mentorName))
                {
                    mentor.Dates.Sort();
                    foreach (var date in mentor.Dates)
                    {
                        Console.WriteLine("-- {0:dd/MM/yyyy}", date);
                    }
                }
            }
        }

        static void InputComents(List<string> MentorsName, List<Coment> Coments)
        {
            var firstLine = Console.ReadLine();
            while (firstLine != "end of comments")
            {
                var line = firstLine.Split(new char[] { '-' }).ToList();
                if (MentorsName.Contains(line[0]))
                {
                    if (line.Count != 1)
                    {
                        Coments.Add(new Coment(line[0], line[1]));
                    }
                }
                firstLine = Console.ReadLine();
            }
        }

        static void InputMentors(List<Mentor> Mentors, List<string> MentorsName)
        {
            var firstLineMentor = Console.ReadLine();
            while (firstLineMentor != "end of dates")
            {
                var line = firstLineMentor.Split(new char[] { ' ', ',' }).ToList();
                int kk2 = MentorsName.IndexOf(line[0]);

                List<DateTime> kk = new List<DateTime>();
                for (int i = 1; i < line.Count; i++)
                {
                    if (kk2 == -1)
                    {
                        kk.Add(DateTime.ParseExact(line[i], "dd/MM/yyyy", CultureInfo.InvariantCulture));
                    }
                    else
                    {
                        Mentors[kk2].Dates.Add(DateTime.ParseExact(line[i], "dd/MM/yyyy", CultureInfo.InvariantCulture));
                    }
                }

                if (kk2 == -1)
                {
                    Mentors.Add(new Mentor(line[0], kk));
                    MentorsName.Add(line[0]);
                }
                firstLineMentor = Console.ReadLine();
            }
        }
    }

    class Coment
    {
        public Coment(string mentorName, string comentText)
        {
            this.MentorName = mentorName;
            this.ComentText = comentText;
        }


        public string MentorName { get; set; }

        public string ComentText { get; set; }
    }

    class Mentor
    {
        public Mentor(string name, List<DateTime> dates)
        {
            this.Name = name;
            this.Dates = dates;
        }


        public string Name { get; set; }

        public List<DateTime> Dates { get; set; }
    }
}