#include <cstdio>
#include <vector>

using namespace std;

vector<int> sol;
int v[100010],q[100010],d[100010],tata[100010];

int main()
{
    freopen("scmax.in", "r", stdin);
    freopen("scmax.out", "w", stdout);
    int n,poz=0,nr=0;
    scanf("%d",&n);
    for(int i=1;i<=n;i++) scanf("%d",&v[i]);
    for(int i=1;i<=n;i++)
    {
        int st=1,dr=nr;
        while(st<=dr)
        {
            int mid=(st+dr)/2;
            if(v[i]<=v[q[mid]]) dr=mid-1;
            else st=mid+1;
        }
        if(st==nr+1) nr++;
        q[st]=i;
        tata[i]=q[st-1];
        d[i]=d[q[st-1]]+1;
    }
    for(int i=1;i<=n;i++)
        if(d[i]>d[poz]) poz=i;
    for(;poz;poz=tata[poz]) sol.push_back(v[poz]);
    printf("%d\n",sol.size());
    for(int i=sol.size()-1;i>=0;i--) printf("%d ",sol[i]);
    return 0;
}