03. Nikulden’s meals

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

namespace ConsoleApp33
{
    class Program
    {
        static void Main(string[] args) {
            Dictionary<string, List<string>> guests = new Dictionary<string, List<string>>();
            int unliked = 0;

            string[] cmd;
            while ((cmd = Console.ReadLine().Split('-'))[0] != "Stop") {
                string guest = cmd[1], meal = cmd[2];
                if (cmd[0] == "Like") {
                    if (!guests.ContainsKey(guest)) {
                        guests[guest] = new List<string> { meal };
                    } else if (guests[guest].IndexOf(meal) == -1) {
                        guests[guest].Add(meal);
                    }
                } else { // Unlike
                    int index;
                    if (!guests.ContainsKey(guest)) {
                        Console.WriteLine($"{guest} is not at the party.");
                    } else if((index = guests[guest].IndexOf(meal)) == -1) {
                        Console.WriteLine($"{guest} doesn't have the {meal} in his/her collection.");
                    } else {
                        guests[guest].RemoveAt(index);
                        unliked++;
                        Console.WriteLine($"{guest} doesn't like the {meal}.");
                    }
                }
            }

            guests
                .OrderByDescending(kvp => kvp.Value.Count)
                .ThenBy(kvp => kvp.Key)
                .ToList()
                .ForEach(kvp => {
                    Console.WriteLine($"{kvp.Key}: {string.Join(", ", kvp.Value)}".Trim());
                });

            Console.WriteLine($"Unliked meals: {unliked}");
        }
    }
}