UniqueUsernames

package com.company;

import java.util.LinkedHashSet;
import java.util.Scanner;
import java.util.Set;

public class UniqueUsernames {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        sc.nextLine();
        Set<String> set = new LinkedHashSet<String>();
        while (n > 0) {
            String name = sc.nextLine();
            if (!set.contains(name)){
                System.out.println(name);
                set.add(name);
            }
            n--;
        }
    }
}