import java.util.*;
import java.io.*;
import java.util.regex.*;
import java.util.List;
 
class Program {
public static void main (String[] args) throws java.lang.Exception	{
 
String subject = "john(man,24,engineer),smith(man,23),smiley:)(notaperson) ";
Pattern regex = Pattern.compile("\\([^()]*\\)|(,)");
Matcher m = regex.matcher(subject);
StringBuffer b= new StringBuffer();
while (m.find()) {
    if(m.group(1) != null) m.appendReplacement(b, "@");
    else m.appendReplacement(b, m.group(0));
}
m.appendTail(b);
String replaced = b.toString();
System.out.println(replaced);
} // end main
} // end Program

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