#include <iostream>
#include <fstream>

using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");

#define pb push_back
#define ui unsigned int
const ui NMax = 1e5 + 5;

int N,nrSol;
int pre[NMax],v[NMax],sol[NMax];

void print(int);

int main() {
    in>>N;
    for (int i=1;i<=N;++i) {
        in>>v[i];

        int poz = 0,pw = 1;
        while (pw <= nrSol) {
            pw <<= 1;
        }
        pw >>= 1;

        while (pw) {
            if (poz + pw <= nrSol && v[sol[poz+pw]] <= v[i]) {
                poz += pw;
            }

            pw >>= 1;
        }

        if (v[sol[poz]] == v[i]) {
            continue;
        }

        sol[poz+1] = i;
        pre[i] = sol[poz];

        if (poz == nrSol) {
            ++nrSol;
        }
    }

    out<<nrSol<<'\n';
    print(sol[nrSol]);

    in.close();out.close();
    return 0;
}

void print(int i) {
    if (i == 0) {
        return;
    }

    print(pre[i]);
    out<<v[i]<<' ';
}