#include <fstream>
#define NM 100010
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");

int n, v[NM], s[NM], p[NM], maxi, ok, poz;
int main()
{
    fin>>n;
    fin>>v[1];
    s[1] = v[1];
    p[1] = 1;
    maxi = 1;
    for(int i = 2; i <= n; ++i){
        fin>>v[i];
        ok = 0;
        poz = 0;
        for(int j = 1; j <= maxi && !ok; ++j)
            if(s[j] >= v[i]){
                ok = 1;
                poz = j;
            }
        if(ok){
            s[poz] = v[i];
            p[i] = poz;
        }
        else {
            maxi++;
            s[maxi] = v[i];
            p[i] = maxi;
        }
    }
    fout<<maxi<<'\n';
    p[n + 1] = maxi + 1;
    poz = 1;
    for(int j = 1; j <= n; ++j)
        if(p[j] == poz && p[j + 1] != p[j]){
            poz++;
            fout<<v[j]<<" ";
        }
    return 0;
}