#include <iostream>
#include<fstream>
using namespace std;
int v[100001],i,n,j,k,b[100001],p[1000001];
ifstream f("scmax.in");
ofstream g("scmax.out");
void rez()
{
     int max,ok,x=0,k=0,y;
b[1]=1;
    for(i=2;i<=n;i++)
    {
        max=0;p[i]=-1;
        for(j=1;j<i;j++)
            if(v[j]<v[i]&&b[j]>max)
                max=b[j];
                {
                    p[i]=j;
                }
        b[i]=max+1;
        if(x<b[i])
        {
            x=b[i];
        }
    }
    max=0;
    g<<x<<endl;
    /*for(i=1;i<=n;i++)
    {
        if(max<b[i])
        {


            max=b[i];
        while(b[i]==max)
        {
            ok=1;
            i++;
        }
        i--;
        if(ok&&k<x)
        {
        g<<v[i]<<" ";
        k++;
        }
        }
    }*/
    for(i=n;i>=1&&x;i--)
    {
        if(b[i]==x)
        {


        p[x]=v[i];
        x--;
        k++;
        }
    }
    for(i=1;i<=k;i++)
        g<<p[i]<<" ";
}
int main()
{

    f>>n;
    for(i=1;i<=n;i++)
        f>>v[i];
    rez();
    return 0;
}