Phone

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

namespace Phone
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            List<string> listOfNumbers = Console.ReadLine().Split().ToList();
            List<string> listOfNames = Console.ReadLine().Split().ToList();
            List<string> resultNames = new List<string>();
            List<string> resultNumbers = new List<string>();

            string command = string.Empty;

            while ((command = Console.ReadLine()) != "done")
            {
                string[] commandArray = command.Split();

                if (commandArray[0] == "call" && listOfNumbers.Exists(x => x == commandArray[1]))
                {
                    string phoneNumber = commandArray[1];
                    int phoneIndex = listOfNumbers.IndexOf(phoneNumber);
                    string name = listOfNames[phoneIndex];
                    Console.WriteLine($"calling {name}...");

                    CalculateSumOfDigitsAndPrintAnswer(phoneNumber);

                }

                else if (commandArray[0] == "call" && listOfNames.Exists(x => x == commandArray[1]))
                {
                    string name = commandArray[1];
                    int indexOfName = listOfNames.IndexOf(name);
                    string phoneNumber = listOfNumbers[indexOfName];
                    Console.WriteLine($"calling {phoneNumber}...");

                    CalculateSumOfDigitsAndPrintAnswer(phoneNumber);
                }

                else if (commandArray[0] == "message" && listOfNumbers.Exists(x => x == commandArray[1]))
                {
                    string phoneNumber = commandArray[1];
                    int phoneIndex = listOfNumbers.IndexOf(phoneNumber);
                    string name = listOfNames[phoneIndex];
                    Console.WriteLine(($"sending sms to {name}..."));

                    CalculateDifferenceOfDigitsAndPrintAnswer(phoneNumber);
                }

                else if (commandArray[0] == "message" && listOfNames.Exists(x => x == commandArray[1]))
                {
                    string name = commandArray[1];
                    int indexOfName = listOfNames.IndexOf(name);
                    string phoneNumber = listOfNumbers[indexOfName];
                    Console.WriteLine($"sending sms to {phoneNumber}...");

                    CalculateDifferenceOfDigitsAndPrintAnswer(phoneNumber);
                }
            }

        }

        private static void CalculateDifferenceOfDigitsAndPrintAnswer(string phoneNumber)
        {
            int difference = 0;

            for (int i = 0; i < phoneNumber.Length; i++)
            {
                if (int.TryParse(phoneNumber[i].ToString(), out int result)) // TryParse()
                {
                    difference = difference - result;
                }
            }

            if (difference % 2 != 0)
            {
                Console.WriteLine("busy");
            }

            else if (difference % 2 == 0)
            {
                Console.WriteLine("meet me there");
            }
        }

        private static void CalculateSumOfDigitsAndPrintAnswer(string phoneNumber)
        {
            int sum = 0;
            for (int i = 0; i < phoneNumber.Length; i++)
            {
                if (int.TryParse(phoneNumber[i].ToString(), out int result)) // TryParse()
                {
                    sum += result;
                }
            }

            if (sum % 2 != 0)
            {
                Console.WriteLine("no answer");
            }

            else if (sum % 2 == 0)
            {
                int minutes = sum / 60;
                int secundes = sum % 60;
                Console.WriteLine($"call ended. duration: {minutes:D2}:{secundes:D2}");
            }

        }

    }

}