#include <bits/stdc++.h>
using namespace std;

ifstream cin("scmax.in");
ofstream cout("scmax.out");

int n,a[100001];
int best[100001];
int pre[100001],v[100001];

int main()
{
    cin>>n;
    int x=0;
    for(int i=1; i<=n; i++)
    {
        cin>>a[i];
        int in=1,sf=x;
        int r=0;
        while(in<=sf)
        {
            int mij=(in+sf)/2;
            if(a[best[mij]]<a[i])
            {
                in=mij+1;
                r = mij;
            }
            else
            {
                sf=mij-1;
            }
        }
        best[r+1]=i;
        pre[i]=best[r];
        if(r==x) x++;
    }
    cout<<x<<"\n";
    int cop=x;
    int poz = best[x];
    while(x > 0)
    {
        v[x] = a[poz];
        x--;
        poz = pre[poz];
    }
    for(int i=1; i<=cop; i++)
    {
        cout<<v[i]<<" ";
    }
    return 0;
}