import java.util.*;
import java.util.regex.*;
import java.lang.*;
import java.io.*;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String text = "0001113033AA55608981";
		Matcher m = Pattern.compile("^(0*\\w{4})(.*)(\\w{4})$").matcher(text);
		StringBuffer result = new StringBuffer();
		 while (m.find()) {
			m.appendReplacement(result, m.group(1) + String.join("", Collections.nCopies(m.group(2).length(), "*")) + m.group(3));
		 }
		 m.appendTail(result);
		 System.out.println(result.toString());
	}
}

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