#include<bits/stdc++.h>
#define ll long long
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
ll v[1000001], ans[1000001], maxim, maxim1, poz[1000001], l, b, n, d[1000001];
ll cb(ll x, ll dr)
{
    ll st=1, anscb=0, mid;
    while(st<=dr)
    {
        mid=(st+dr)/2;
        if(v[poz[mid]]<x)
        {
            anscb=mid;
            st=mid+1;
        }
        else
            dr=mid-1;
    }
    return anscb;
}
int main()
{
    f>>n;
    for(ll i=1; i<=n; i++)
    {
        f>>v[i];
        b=cb(v[i], l);
        d[i]=b+1;
        if(b+1>l)
            l=b+1;
        poz[b+1]=i;
        if(d[i]>maxim)
            maxim=d[i];
        //g<<d[i]<<' '<<poz[b+1]<<'\n';
    }
    //return 0;
    maxim1=maxim;
    g<<maxim<<'\n';
    for(ll i=n; i>=1 && maxim; i--)
    {
        if(d[i]==maxim)
        {
            ans[maxim]=v[i];
            maxim--;
        }
    }
    for(ll i=1; i<=maxim1; i++)
        g<<ans[i]<<' ';
    return 0;
}