#include <iostream>
#include<fstream>
using namespace std;
int n,a[100001],vmax,lmax=0,i,j,k,b[100001],p,c[100001],pmax,x[100001];
int main()
{
    ifstream fin("scmax.in");
    ofstream fout("scmax.out");
    fin>>n;
    for(i=1;i<=n;++i)
    {
        fin>>a[i];
    }
    for(i=1;i<=n;++i)
    {
        vmax=0;
        p=0;
        for(j=1;j<i;j++)
        {
            if(a[i]>a[j] && b[j]>vmax)
            {
                vmax=b[j];
                p=j;
            }
        }
        b[i]=vmax+1;
        c[i]=p;
        if(b[i]>lmax)
        {
            lmax=b[i];
            pmax=i;
        }
    }
    fout<<lmax<<endl;
    k=0;
    for(i=pmax;i!=0;i=c[i])
    {
        k++;
        x[k]=a[i];
    }
    for(i=k;i>=1;i--)
    {
        fout<<x[i]<<' ';
    }
    fin.close();
    fout.close();
    return 0;
}