using System;
using System.Linq;
using System.Text.RegularExpressions;

public class Test
{
  public static void Main()
  {
    var s = "3+6/87*120";
    var tokens = Regex.Matches(s, @"[-+/*]|\d+").OfType<Match>().Select(m => m.Value).ToList();
    
    Console.WriteLine(String.Join("\n", tokens));
  }
}