/* 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
	{

		String abc = "555-372-654-";
    	String hello = abc.replaceAll("[^a-zA-Z0-9]", "");
   		System.out.println(hello.replaceAll("(\\d{3})", "$1-"));
	}
}