public static List<Integer> minCharactersForAnagrams(List<String> a, List<String> b) {
        List<Integer> result = new ArrayList<>();

        for (int i = 0; i < a.size(); i++) {
            String strA = a.get(i);
            String strB = b.get(i);

            if (strA.length() != strB.length()) {
                result.add(-1);
            } else {
                int[] count = new int[26]; // Assuming only lowercase English letters

                for (int j = 0; j < strA.length(); j++) {
                    count[strA.charAt(j) - 'a']++;
                    count[strB.charAt(j) - 'a']--;
                }

                int modifications = 0;
                for (int value : count) {
                    modifications += Math.abs(value);
                }

                result.add(modifications / 2);
            }
        }

        return result;
    }