using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Text;
public class MainClass
{
public static void Main()
{
string s1 = " My ";
Console.WriteLine(s1);
Console.WriteLine(s1.Trim());
string s2 = "__...,, r!,..._";
Console.WriteLine(s2);
char[] trimChars = new char[] { '.', ',', '_' };
Console.WriteLine(s2.Trim(trimChars));
Console.WriteLine(s2.TrimStart(trimChars));
Console.WriteLine(s2.TrimEnd(trimChars));
}
}