import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class JI9050673 {

	public static void main(String[] args) {
		Pattern p = Pattern.compile("([a-z]([a-z]))+[a-z][a-z]"); 
		Matcher m = p.matcher("abcdef"); 
		if(m.matches() ){ 
		    System.out.println("Group 2 is " + m.group(2) ); 
		} 
	}
}