using System;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		Regex re = new Regex("[.?!]*(?=[.?!]$)");
		Console.WriteLine(re.Replace("This is a string....!", ""));
		Console.WriteLine(re.Replace("his is another...!!", ""));
		Console.WriteLine(re.Replace("What is this..!?!?", ""));
	}
}