import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int n = Integer.parseInt(br.readLine());
		String[] sa = br.readLine().split(" ");
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = Integer.parseInt(sa[i]);
		}
		br.close();

		int[] dp = new int[n + 1];
		List<List<Integer>> list = new ArrayList<>(n + 1);
		list.add(new ArrayList<>());
		for (int i = 1; i <= n; i++) {
			dp[i] = Integer.MAX_VALUE;
			list.add(new ArrayList<>());
		}

		for (int i = 0; i < n; i++) {
			int idx = Arrays.binarySearch(dp, a[i]);
			if (idx < 0) idx = ~idx;
			dp[idx] = a[i];
			list.get(idx).add(i);
		}

		int lis = Arrays.binarySearch(dp, Integer.MAX_VALUE - 1);
		if (lis < 0) {
			lis = ~lis;
			lis--;
		}

		List<Integer> list2 = list.get(lis);
		int size = list2.size();
		int x = list2.get(size - 1);

		int cnt = 0;
		StringBuilder sb = new StringBuilder();
		for (int i = 1; i <= lis; i++) {
			List<Integer> wk = list.get(i);
			int num = 0;
			for (int j = wk.size() - 1; j >= 0; j--) {
				if (wk.get(j) <= x) {
					num = j + 1;
					break;
				}
			}
			if (num == 1) {
				sb.append(a[wk.get(0)]).append(' ');
				cnt++;
			}
		}
		if (cnt > 0) {
			sb.deleteCharAt(sb.length() - 1);
		}
		System.out.println(cnt);
		System.out.println(sb.toString());
	}
}