Odd Occurrences

import java.util.*;


public class OddOccurrences {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String[] sequence = scanner.nextLine().split(" ");

        LinkedHashMap<String, Integer> count = new LinkedHashMap<>();

        for (String sequenceOfWords : sequence) {
            String wordLowerCase = sequenceOfWords.toLowerCase(Locale.ROOT);
            if (count.containsKey(wordLowerCase)) {
                count.put(wordLowerCase, count.get(wordLowerCase) + 1);
            } else {
                count.put(wordLowerCase, 1);
            }
        }

        ArrayList<String> oddElement = new ArrayList<>();

        for (var entry : count.entrySet()) {
            if (entry.getValue() % 2 == 1) {
                oddElement.add(entry.getKey());
            }
        }

        for (int i = 0; i < oddElement.size(); i++) {
            System.out.print(oddElement.get(i));
            if (i < oddElement.size() - 1) {
                System.out.print(", ");
            }
        }
    }
}