#include<bits/stdc++.h>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,i,v[100010],d[100010],st,dr,mid,k;
int main()
{
    fin>>n;
    for(i=1;i<=n;i++)fin>>v[i];
    d[++k]=v[1];
    for(i=2;i<=n;i++)
    {
        st=1;dr=k;
        while(st<=dr)
        {
            mid=(st+dr)/2;
            if(v[i]>d[mid]) st=mid+1;
            else dr=mid-1;
        }
        if(st==k+1) d[++k]=v[i];
        else d[st]=v[i];
    }
    fout<<k<<"\n";
    for(i=1;i<=k;i++) fout<<d[i]<<" ";
    return 0;
}