import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String s = "7108898787654351"; // **0**********351
		System.out.println(s.replaceAll("(?<=.{3}|^.{0,1}).(?=.*...)", "*")); 
		System.out.println(s.replaceAll("(?<=.{3}|^|^.).(?=.*...)", "*")); 
	}
}