class Smartphone : IInternet, Calling
{
        private bool IsValid(string number)
        {
            for (int i = 0; i < number.Length; i++)
            {
                if (char.IsDigit(number[i])==false)//ako ne e chislo
                {
                    return false;
                }
            }
                return true;
        }

        private bool IsValidSite(string site)
        {
            for (int i = 0; i < site.Length; i++)
            {
                if (char.IsDigit(site[i]))//ako e number false
                {
                    return false;
                }
            }
            //aKO V URL NQMA NUMBERS
                return true;
        }

        public string Call(params string[] nums)
        {

            StringBuilder sb = new StringBuilder();

            foreach (var num in nums)
            {
                if (IsValid(num))//ako e chislo i boolean IsValid vruja true
                {
                    sb.AppendLine("Calling... " + num);
                }
                else
                {
                    sb.AppendLine("Invalid number!");
                }

            }
                return sb.ToString().TrimEnd();
        }

        public string Net(params string[] sites)
        {
            var sb = new StringBuilder();

            foreach (var site in sites)
            {
                if (IsValidSite(site))//ako bolean vruja true
                {
                    sb.AppendLine("Browsing: "+site);
                }
                else//ako vreuja false to znachi ima chislo v url
                {
                    sb.AppendLine("Invalid URL!");
                }

            }
                return sb.ToString().TrimEnd();
        }
}

static void Main(string[] args)
  {
            Smartphone smartphone = new Smartphone();

            var nums = Console.ReadLine().Split();

            var sites = Console.ReadLine().Split();

           Console.WriteLine(string.Join
                (Environment.NewLine,smartphone.Call(nums)));
           Console.WriteLine(string.Join
                (Environment.NewLine,smartphone.Net(sites)));
}