using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {   

        var dictionary = new Dictionary<int, int>()

        {

            {1, 1},

            {2, 2},

            {3, 3},

            {4, 3},

            {5, 5}

        };

        foreach (var kvp in dictionary){ 

            Console.Write(kvp.Value.ToString());

        }

        Console.WriteLine();

        var valueToRemove = 3;

        var newDictionary = dictionary.GroupBy(_ => _.Value).Where(_ => _.Key != valueToRemove).ToDictionary(_=> _.Single(), _ => _.Key);

        foreach (var kvp in newDictionary){ 

            Console.Write(kvp.Value.ToString());

        }

        Console.WriteLine();

    }

}