03. Periodic Table

package Uprajnenie;

import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;

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


        // Read the number of compounds
        int n = scanner.nextInt();
        scanner.nextLine(); // Consume the newline character

        Set<String> uniqueElements = new TreeSet<>();

        // Read each compound and add elements to the set
        for (int i = 0; i < n; i++) {
            String compound = scanner.nextLine();
            String[] elements = compound.split("\\s+");
            for (String element : elements) {
                uniqueElements.add(element);
            }
        }

        // Print the unique elements in ascending order
        for (String element : uniqueElements) {
            System.out.print(element + " ");
        }

        scanner.close();
    }
}