using System;
using System.Linq;
using System.Text.RegularExpressions;
public class Test
{
	public static void Main()
	{
		var s = "abc({";
		var results = Regex.Split(s, @"(\()").Where(m=>!string.IsNullOrEmpty(m)).ToList();
		Console.WriteLine(string.Join(", ", results));
	}
}