03. Odd Occurrences

package mapAndStreamAPI;

import java.util.*;

public class P03OddOccurrences {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

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

        Map<String, Integer> countWordsMap = new LinkedHashMap<>();

        for (String word : wordsArr) {
            String wordToLower = word.toLowerCase();

            if (countWordsMap.containsKey(wordToLower)) {
                int currentCount = countWordsMap.get(wordToLower);
                countWordsMap.put(wordToLower, currentCount + 1);
            } else {
                countWordsMap.put(wordToLower, 1);
            }
        }

        List<String> oddCountWords = new ArrayList<>();

        for (Map.Entry<String, Integer> entry : countWordsMap.entrySet()) {
            int count = entry.getValue();
            if (count % 2 != 0) {
                oddCountWords.add(entry.getKey());
            }
        }

        System.out.println(String.join(", ", oddCountWords));
    }
}