#include <fstream>
#include <vector>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
const int nMax = 100005;
int n, v[nMax], dp[nMax], M[nMax];
int main(){
    int lgmax, i, st, dr, poz, mij;
    f >> n;
    for (i = 1; i <= n; ++i) 
        f >> v[i];
    dp[n] = 1;
    M[1] = v[n];
    lgmax = 1;
    for (i = n - 1; i >= 1; --i) {
        st = 1, dr = lgmax;
        poz = 0;
        while (st <= dr) {
            mij = (st + dr) / 2;
            if (v[i] >= M[mij]) 
                dr = mij - 1;
            else {
                st = mij + 1;
                poz = mij;
            }
        }
        dp[i] = poz + 1;
        M[poz + 1] = max(M[poz + 1], v[i]);
        lgmax = max(lgmax, dp[i]);
    }
    g << lgmax << '\n';
    for (i = 1; i <= n; i++) {
        if (dp[i] == lgmax) {
            g << v[i] << ' ';
            lgmax--;
        }
    }
    return 0;
}