using System;
 
public class Test
{
	public static void Main()
	{
		string str = "Jan van Rijswijcklaan 124";
var array = str.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
 
string streetname = "";
string streetnumber = "";
foreach (var item in array)
{
     if (Char.IsNumber(item[0]))
         streetnumber += item;
      else
         streetname += item + " ";
}
 
Console.WriteLine(streetname.TrimEnd());
Console.WriteLine(streetnumber);
	}
}

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