using System;
using System.IO;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
        Console.WriteLine(FindDispo_InInfo("12/11/2015: Liefertermin 71994 : 30.11.2015 -> 27.11.2015"));
	}
	private static string FindDispo_InInfo(string text)
    {
        Regex pattern = new Regex(@"\b[0-9]{5}\b");
        Match match = pattern.Match(text);
        if (match.Success)
        	return match.Value;
        else
        	return string.Empty;
    }
}