MixedPhones

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

namespace MixedPhones
{
    class Program
    {
        static void Main(string[] args)
        {
            SortedDictionary<string, long> phones = new SortedDictionary<string, long>();
            string[] input = Console.ReadLine().Split(new char[] { ' ', ':' }, StringSplitOptions.RemoveEmptyEntries);

            while (input[0] != "Over")
            {
                string keyInput = input[0];
                string valueInput = input[1];
                long numValue = 0;
                long numValue2 = 0;
                bool testParse = (long.TryParse(keyInput, out numValue));
                bool testparse2 = (long.TryParse(valueInput, out numValue2));
                if (testParse == true)
                {
                    phones[valueInput] = numValue;
                }
                else
                {
                    if (phones.ContainsKey(valueInput))
                    {
                        phones[keyInput] = phones[valueInput];
                    }
                }
                if (testparse2 == true)
                {
                    phones[keyInput] = numValue2;

                    if (phones.ContainsKey(valueInput))
                    {
                        phones[keyInput] = phones[valueInput];
                    }
                }

                input = Console.ReadLine().Split(new char[] { ' ', ':' }, StringSplitOptions.RemoveEmptyEntries);
            }
            foreach (KeyValuePair<string, long> item in phones)
            {
                Console.WriteLine($"{item.Key} -> {item.Value}");
            }
        }
    }
}