using System;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
		var r = new Regex("^\\d(\\d|(?<!-)-)*\\d$|^\\d$");
                Console.WriteLine(r.IsMatch("1-2-3"));
                Console.WriteLine(r.IsMatch("1-222-3333"));
                Console.WriteLine(r.IsMatch("123"));
                Console.WriteLine(r.IsMatch("1--23"));
                Console.WriteLine(r.IsMatch("1-2-3-"));
                Console.WriteLine(r.IsMatch("1"));
                Console.WriteLine(r.IsMatch("-11-2-3-"));
	}
}

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