/* 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 str = "HH12HH";
		Pattern p = Pattern.compile("(\\G(?!^)|^(?=(?:HH12|HH)+$))(?:HH12|HH)");
		List<String> res = new ArrayList<>();
    	Matcher m = p.matcher(str);
	    while (m.find()) {
	    	res.add(m.group());
	    }
    	System.out.println(res);
	}
}