import java.util.*;
import java.lang.*;

class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
        String myString = "this filename.has[characters')which/should%be@replaced.txt";
		myString = myString.replaceAll("[^a-zA-Z0-9.-]", "_");
        System.out.println(myString);
	}
}