#include <bits/stdc++.h>

using namespace std;

int v[100055],in;

int aux[100055];

int x[100055];

vector <int> q;

int main()
{
    ifstream cin("scmax.in");
    ofstream cout("scmax.out");
    v[0]=0;
    int n;
    cin>>n;
    x[0]=INT_MIN;
    for(int i=1;i<=n;++i)
    {
        cin>>x[i];
        if(x[i]>x[v[in]])
        {
            ++in;
            v[in]=i;
            aux[i]=v[in-1];
        }
        else
        {
            int st=1,dr=in,mij,ii=-1;
            while(st<=dr)
            {
                mij=(st+dr)/2;
                if(x[v[mij]]>x[i])
                {
                    dr=mij-1;
                    ii=mij;
                }
                else
                {
                    st=mij+1;
                }
            }
            if(ii!=-1)
            {
                v[ii]=i;
                aux[i]=v[ii-1];
            }
        }
    }
    cout<<in<<"\n";
    int nr=v[in];
    while(nr!=0)
    {
        q.push_back(x[nr]);
        nr=aux[nr];
    }
    for(int i=q.size()-1;i>=0;--i)
    {
        cout<<q[i]<<" ";
    }
    return 0;
}