/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
        final String regex = "[^a-zA-Z0-9_.-]|(?<!\\d)\\.(?!\\d)|(?<!\\w)-(?!\\w)";
        final String string = "x.y.z a - b THE - . SOCIAL IMPACT OF THE CHERNOBYL DISASTER BY DAVID R. MARPLES "
                + "(ST. MARTIN'S PRESS: $35, CLOTH; $14.95, PAPER; 316 PP., ILLUSTRATED; 0-312-02432-0)\n\n\n";
 
        String result=string.replaceAll(regex," ");
        System.out.println(result);
	}
}

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