HornetArmada

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

public class HornetArmada
{
    public static void Main()
    {
        //STORAGE
        Dictionary<string, Activity> activities = new Dictionary<string, Activity>();

        // GET ALL INPUT AND SAVE TO STORAGE
        int inputCount = int.Parse(Console.ReadLine());
        for (int i = 0; i < inputCount; i++)
        {
            string[] input = Console.ReadLine().Split(new[] { ' ', '=', '-', '>', ':' }, StringSplitOptions.RemoveEmptyEntries).Select(x => x.Trim()).ToArray();
            string regionName = input[1];

            if (activities.ContainsKey(regionName))
            {
                activities[regionName].ActNumber.Add(int.Parse(input[0]));
                activities[regionName].RegionName = regionName;
                activities[regionName].SoldierTypes.Add(input[2]);
                activities[regionName].SoldierCount += long.Parse(input[3]);
            }
            else
            {
                Activity act = new Activity();
                act.ActNumber.Add(long.Parse(input[0]));
                act.RegionName = regionName;
                act.SoldierTypes.Add(input[2]);
                act.SoldierCount += long.Parse(input[3]);
                activities.Add(regionName,act);
            }
        }
        string[] lastInput = Console.ReadLine().Split('\\');

        //MAIN LOGIC
        if (lastInput.Length == 1)
        {
            var a = activities.Where(x => x.Value.SoldierTypes.Contains(lastInput[0].Trim()));

            Dictionary<string, long> additionalVariableForPrintingResult = new Dictionary<string, long>();
            foreach (var item in a)
            {
                additionalVariableForPrintingResult.Add(item.Key,item.Value.ActNumber.Max());
            }
			//PRINT TO CONSOLE
            foreach (var item in additionalVariableForPrintingResult.OrderByDescending(x=>x.Value))
            {
                Console.WriteLine($"{item.Value} : {item.Key}");
            }
        }
    }
}

public class Activity
{
    public List<long> ActNumber = new List<long>();
    public string RegionName { get; set; }
    public List<string> SoldierTypes = new List<string>();
    public long SoldierCount { get; set; }
}