#include <fstream>

using namespace std;
ifstream cin("scmax.in");
ofstream cout("scmax.out");
int v[100005],i,n,j,maxl,c,a[100005];
struct tle
{
    int x; int y;
}l[100005];
int main()
{
    cin>>n;
    for(i=1;i<=n;i++)
    {
        cin>>v[i];
        for(j=0;j<i;j++)
        if(l[j].x+1>l[i].x&&v[j]<v[i])
        {
            l[i].x=l[j].x+1;
            l[i].y=j;
        }
    }
    maxl=0;
    j=0;
    for(i=1;i<=n;i++)
    if(l[i].x>maxl)
    {
        maxl=l[i].x;
        j=i;
    }
    a[1]=v[j];
    c=1;
    while(l[j].y!=0)
    {
        a[++c]=v[l[j].y];
        j=l[j].y;
    }
    cout<<c<<'\n';
    for(i=c;i>0;i--)
        cout<<a[i]<<" ";
    return 0;
}