/* 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 email = "testing@gmail.com";
        StringBuilder sb = new StringBuilder(email);
        int mp = sb.lastIndexOf("@");
        int dp = sb.substring(mp).indexOf(".");
        for (int i = 1; i < sb.length(); i++) {
            if (i != mp && i != mp - 1 && i != mp + 1 && i != ((mp + dp) - 1) && i < (dp + mp)) {
                sb.setCharAt(i, '*');
            }
        }
        System.out.println(sb.toString());
	}
}

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