#include <fstream>

using namespace std;
int n,l[10001],a[10001],p,max1,j,i;
int main()
{ifstream f("scmax.in");
ofstream g("scmax.out");
    f>>n;
    for(i=1;i<=n;i++)f>>a[i];
       for(i=n;i>=1;i--)
       {max1=0;
        for(j=i+1;j<=n;j++)
             {if(l[j]>max1&&a[j]>a[i])
                 max1=l[j];

             }
             l[i]=max1+1;
       }
       max1=0;
       for(i=1;i<=n;i++)
       {if(l[i]>max1){max1=l[i];p=i;}}
     g<<max1<<'\n';
       while(max1>0)
       {g<<a[p]<<" ";
       max1--;
        for(i=p+1;i<=n;i++)
             if(a[i]>a[p]&&l[i]==max1)
        {p=i;
         break;
        }

       }
    return 0;
}