[Java Basics][Collections-HW] 10. Extract All Unique Words

import java.util.ArrayList;
import java.util.Scanner;

public class ExtractAllUniqueWords {

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

        String input = sc.nextLine().toLowerCase();
        String[] words = input.split("\\W+");

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

        for (int i = 0; i < words.length; i++) {
            if(!finalWords.contains(words[i])) {
                finalWords.add(words[i]);
            }
        }
        finalWords.sort(null);

        for (String str : finalWords) {
            System.out.print(str + " ");
        }
    }
}