#include<bits/stdc++.h>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
long long n,i,v[100010],d[100010],st,dr,mid,k,r[100010];
void afis(int k)
{
    if(k==0) return;
    afis(r[k]);
    fout<<v[k]<<" ";
}

int main()
{
    fin>>n;
    for(i=1;i<=n;i++)fin>>v[i];
    d[++k]=1;
    for(i=2;i<=n;i++)
    {
        st=1;dr=k;
        while(st<=dr)
        {
            mid=(st+dr)/2;
            if(v[i]>v[d[mid]]) st=mid+1;
            else dr=mid-1;
        }
        if(st==k+1) d[++k]=i;
        else d[st]=i;
        r[i]=d[st-1];
    }
    fout<<k<<"\n";
    afis(d[k]);
    return 0;
}