using System;
using System.Text.RegularExpressions;


public class Test
{
	public static void Main()
	{
		Regex regex = new Regex(@"\d{4}-\d{3,4}");
		Match match = regex.Match("123456-12345");
		if(match.Success) 
		{
		   Console.WriteLine(match.Value);
		}
	}
}