p1.java

public class Main {
  public static void main(String[] args) {
    Set<String> ingredients = new HashSet();
    Set<String> allergens = new HashSet();

    for (int i = 0; i < args.length(); i++) {
      String[] cols = args.get(i).split(" (contains ");
      String[] ings = cols[0].split(" ");
      for (Sring ing : ings) {
        ingredients.add(ing);
      }
      String[] alles = cols[1].substring(0, cols[1].length()-2).split(", ");
      for (String alle : alles) {
        allergens.add(alle);
      }
    }

    System.out.println(ingredients);
    System.out.println(allergens);
  }
}