//package lis;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.Scanner;

/**
 * Created on 30.10.2016.
 */
public class Main {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner reader = new Scanner(new FileReader(args[0]));

        int[] data = readInput(reader);
        int[] results = solveTasks(data);
        writeResults(results);

        reader.close();
    }

    private static int[] readInput(Scanner reader) {
        int n = reader.nextInt();
        int data[] = new int[n];

        for (int i = 0; i < n; i++) {
            data[i] = reader.nextInt();
        }

        return data;
    }

    private  static int lowerBound(int[] array, int left, int right, int key) {
        int n = array.length;

        while (true) {
            int mid = (left + right ) / 2;
            if (array[mid] >= key) {
                right = mid -1;
                if (right < left)
                    return mid;
            } else {
                left = mid + 1;
                if (right < left)
                    return mid < n - 1 ? right + 1 : -1;
            }
        }
    }

    private static int[] solveTasks(int[] data) {
        int[] pos = new int[data.length];
        int[] c = new int[data.length];
        int sol = Integer.MIN_VALUE;

        for (int i = 0; i < data.length; i++) {
            c[i] = Integer.MAX_VALUE;
            int index = lowerBound(c, 0, i, data[i]);
            pos[i] = index;
            c[index] = data[i];
            sol = Math.max(sol, index);
        }

        int[] result = new int[sol + 1];
        for (int i = data.length - 1; sol >= 0; i--) {
            if (pos[i] == sol) {
                result[sol--] = data[i];
            }
        }
        return result;
    }

    private static void writeResults(int[] data) {
        System.out.println(data.length);
        for (int number : data) {
            System.out.print(number + " ");
        }

    }
}