#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int a[100005],v[100005],poz[100005],tata[100005],n,lg,mij;
int main() {
    fin >> n;
    for (int i = 1; i <= n; i++)
        fin >> a[i];
    for (int i = 1; i <= n; i++) {
        st = 1;
        dr = lg;
        p = lg + 1;
        while (st <= dr) {
            mij = (st + dr) / 2;
            if (v[mij] >= a[i]) {
                p = mij;
                dr = mij - 1;
            } 
            else st = mij + 1;
        }
        if (p == lg + 1)
            lg++;
        v[p] = a[i];
        poz[p] = i;
        if (p > 1)
            tata[i] = poz[p - 1];
    }
    fout << lg << endl;
    int sol[100005],k=0,x=poz[lg];
    while (x != 0) {
        sol[++k] = a[x];
        x = tata[x];
    }
    for (int i = k; i >= 1; i--)
        fout << sol[i] << ' ';
    return 0;
}