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- import java.util.Arrays;
- import java.util.Scanner;
- public class D {
- public static void main(String[] args) {
- int[] a = new int[cin.nextInt()];
- for (int i = 0; i < a.length; i++) {
- a[i] = cin.nextInt();
- }
- Arrays.sort(a);
- int count = 0;
- for (int i = 0; i < a.length; i++) {
- if (i == 0 || a[i] != a[i - 1])
- ++count;
- }
- System.out.println(count);
- for (int i = 0; i < a.length; i++) {
- if (i == 0 || a[i] != a[i - 1])
- System.out.print(a[i] + " ");
- }
- System.out.println();
- }
- static Scanner cin = new Scanner(System.in);
- }
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