using System;
using System.Text.RegularExpressions;

class Regexip {
	static void Main(string[] args)	{
		if (args.Length < 1) {
			Console.WriteLine("regexip <IP Address>");
		} else {
			Regex regex = new Regex(@"\d+\.\d+\.\d+\.\d+");
			Match m = regex.Match(args[0]);
			if (m.Success) {
				Console.WriteLine(m.Value);
			}
		}
	}
}