#include <iostream>
#include <map>
#include <fstream>
using namespace std;

ifstream fin("scmax.in");
ofstream fout("scmax.out");

const int MAX_LENGTH = 100000;

int minValue[MAX_LENGTH + 1];
int maxSubsequenceLen[MAX_LENGTH + 1];
int maxLen;
int lastElement;

map<int, int> pos;

void output(int lastElement) {
    if (pos[lastElement] == 0) {
        fout << lastElement << ' ';
        return;
    }
    output(pos[lastElement]);
    fout << lastElement << ' ';
}

int main() {
    int numLen;
    fin >> numLen;
    int nums[MAX_LENGTH + 1];
    for (int i = 1; i <= numLen; ++i) {
        fin >> nums[i];
        minValue[i] = MAX_LENGTH + 1;
    }
    
    for (int i = 1; i <= numLen; ++i) {
        maxSubsequenceLen[i] = 0;
        for (int j = maxLen; j >= 0; --j) {
            if (minValue[j] < nums[i]) {
                minValue[j + 1] = min(minValue[j + 1], nums[i]);
                pos[nums[i]] = minValue[j];
                maxSubsequenceLen[i] = j + 1;
                if (maxSubsequenceLen[i] > maxLen) {
                    maxLen = maxSubsequenceLen[i];
                    lastElement = nums[i];
                }
                break;
            }
        }
    }
    fout << maxLen << '\n';
    output(lastElement);
    return 0;
}