using System;
class Program
{
static void Main()
{
string s = "-c#- >>-progr{123}amm.. #$ing-";
char[] arr = s.ToCharArray();
arr = Array.FindAll<char>(arr, (ch => (char.IsLetterOrDigit(ch)
|| char.IsWhiteSpace(ch)
|| ch == '-')));
s = new string(arr);
Console.WriteLine(s);
}
}
/*
run:
-c- -progr123amm ing-
*/