/* 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 s = "+13334445678";
		System.out.println(s.replaceAll("(?<!^\\+)[0-9](?=[0-9]{4})", "*"));
	}
}