using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Regex.Replace(Regex.Replace("Alpha_!~@#$Numeric%^&*$_#()_+-=[];'/.,{}|:><?Only", @"[^0-9a-zA-Z#$_]+", "_").TrimEnd('_'), "_+", "_"));

    }

}