private static boolean checkTect(String text) {

        int numberOfCharacters = 26;
        Set<String> characters = new HashSet<>();

        String regexp = "[a-zA-Z]";
        Pattern pattern = Pattern.compile(regexp);
        Matcher matcher = pattern.matcher(text);

        int index = 0;
        boolean foundAll = false;
        
        while (matcher.find() && !foundAll) {
            String s = matcher.group().toLowerCase();
            characters.add(s);
            if (characters.size() == numberOfCharacters) {
                foundAll = true;
            }
            index++;
        }

        return foundAll;
    }