#include <fstream>
using namespace std;

ifstream f("scmax.in");
ofstream g("scmax.out");
const int N=100000;
int v[N+1], t[N+1], s[N+1],n;

void lant(int k){
    if(t[k]!=0)
        lant(t[k]);
    g<<v[k]<<" ";
}
int main()
{
    int i,max,j,k,max1=0,p;
    f>>n;
    for(i=1;i<=n;i++)
        f>>v[i];
    s[n]=1;
    for(i = 1; i <= n; i++)
    {
        max = 0;
        for(j = 1; j < i; j++)
            if(v[j] < v[i])
            {
                if(s[j] > max)
                {
                    max = s[j];
                    t[i] = j;
                }
            }
        max++;
        s[i] = max;
    }
    p = 1;
    for(i = 1; i <= n; i++)
        if(s[i] > s[p])
            p = i;
    g << s[p] << "\n";
    lant(p);
    /*
    for(i=n-1;i>=1;i--){
        max=0;
        t[n]=0;
        for(j=i+1;j<=n;j++)
            if(v[i]<v[j] &&s[j]>max){
               max=s[j];
               k=j;
            }
        s[i]=max+1;
        t[i]=k;
        if(s[i]>max1){
            max1=s[i];
            p=i;
        }
    }
    g<<max1<<"\n";
    lant(p);
    */
    return 0;
}