LinqLambda01Proba

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

namespace MultiDictionaries
{
    class Program
    {
        static void Main()
        {
            Dictionary<string, string> words = new Dictionary<string, string>();
            string[] input = Console.ReadLine().Split(new char[] { ' ','-','>' },
                StringSplitOptions.RemoveEmptyEntries);

            Dictionary<string, string> replaced = new Dictionary<string, string>();

            while (input[0] != "end")
            {
                string wordsKey = input[0];
                string wordsValue = input[1];
                words.Add(wordsKey, wordsValue);
            }

            string defaultValue = Console.ReadLine();

            foreach(KeyValuePair<string, string> removed in words)
            {
                string toRemove = "null";
                if (!words.ContainsValue(toRemove))
                {
                    replaced[removed.Key] = defaultValue;
                    words.Remove(removed.Key);
                }

                replaced = replaced.OrderByDescending(pair => pair.Value).
                    ToDictionary(pair => pair.Key,pair => pair.Value);

                Console.WriteLine("{words.Key} -> {words.Value}");
                Console.WriteLine("{replaced.Key} -> {replaced.Value}");
            }
        }
    }
}