/* 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 value1 = "A42z19z037z21zB942z21z4842zC33z449z3884z68z20z";
		String pattern1 = "([A-Z]|(?!\\A)\\G)(\\d+z)";
		Pattern ptrn = Pattern.compile(pattern1);
    	Matcher matcher = ptrn.matcher(value1);
    	ArrayList<ArrayList<String>> result_lst = new ArrayList<ArrayList<String>>();
    	ArrayList<String> lst = null;
    	while (matcher.find()) {
      		if (!matcher.group(1).equals("")) {
      			if (lst != null) result_lst.add(lst);
      			lst = new ArrayList<String>();
      			lst.add(matcher.group(1));
      		}
    		else {
    			lst.add(matcher.group(2));
    	    }
    	}
    	if (lst != null) result_lst.add(lst);
    	System.out.println(result_lst);
	}
}