/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
/* 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 = "nileshkemse@gmail.com";
		System.out.println(s.replaceAll("(^[^@]{3}|(?!^)\\G)[^@]", "$1*"));

	}
}