Почему мой код не работает?

public class Solution { public static String[] strings; public static void main(String[] args) { Scanner input = new Scanner(System.in); strings = new String[6]; for (int count = 0; count < strings.length; count++) { strings[count] = input.nextLine(); } for (int count = 0; count < strings.length; count++) { if (strings[count] == null) continue; for (int second_count = count + 1; second_count < strings.length; second_count++) { if (strings[count].equals(strings[second_count])) { strings[count] = null; strings[second_count] = null; } } } for (int i = 0; i < strings.length; i++) { System.out.print(strings[i] + ", "); } } }