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

ifstream f("scmax.in");
ofstream g("scmax.out");

int v[100005],n,t[100005],r[100005];

void reconstruire(int x)
{
    if(x!=0)
    {
        reconstruire(r[x]);
        g<<v[x]<<" ";
    }
}

signed main()
{
    int i,l=0,st,dr,p;
    f>>n;
    for(i=1;i<=n;i++)
        f>>v[i];
    for(i=1;i<=n;i++)
    {
        st=1;
        dr=l;
        while(st<=dr)
        {
            int mij=(st+dr)/2;
            if(v[t[mij]]<v[i])
                st=mij+1;
            else
                dr=mij-1;
        }
        p=st;
        if(p>l)
            l=p;
        t[p]=i;
        r[i]=t[p-1];
    }
    g<<l<<'\n';
    reconstruire(t[l]);
    return 0;
}