using System;
using System.Linq;
using System.Text.RegularExpressions;
public class Test
{
	public static void Main()
	{
		var s = "Please buy 40 kg of apples for 1350$ each, Please call 8 0 0 4 3 2 1 2 4 3 from 17:00 till 22:00, I would like to bid 50 euro on 20 black and pair of spades";
		var res = Regex.Matches(Regex.Replace(s, @"\W+", ""), @"\d+").Cast<Match>().Select(m=>m.Value).ToList();
		Console.Write(string.Join(", ", res));
	}
}

dXNpbmcgU3lzdGVtOwp1c2luZyBTeXN0ZW0uTGlucTsKdXNpbmcgU3lzdGVtLlRleHQuUmVndWxhckV4cHJlc3Npb25zOwpwdWJsaWMgY2xhc3MgVGVzdAp7CglwdWJsaWMgc3RhdGljIHZvaWQgTWFpbigpCgl7CgkJdmFyIHMgPSAiUGxlYXNlIGJ1eSA0MCBrZyBvZiBhcHBsZXMgZm9yIDEzNTAkIGVhY2gsIFBsZWFzZSBjYWxsIDggMCAwIDQgMyAyIDEgMiA0IDMgZnJvbSAxNzowMCB0aWxsIDIyOjAwLCBJIHdvdWxkIGxpa2UgdG8gYmlkIDUwIGV1cm8gb24gMjAgYmxhY2sgYW5kIHBhaXIgb2Ygc3BhZGVzIjsKCQl2YXIgcmVzID0gUmVnZXguTWF0Y2hlcyhSZWdleC5SZXBsYWNlKHMsIEAiXFcrIiwgIiIpLCBAIlxkKyIpLkNhc3Q8TWF0Y2g+KCkuU2VsZWN0KG09Pm0uVmFsdWUpLlRvTGlzdCgpOwoJCUNvbnNvbGUuV3JpdGUoc3RyaW5nLkpvaW4oIiwgIiwgcmVzKSk7Cgl9Cn0=