#include <fstream>
#include <cmath>
#include <algorithm>
#include <cstring>
using namespace std;
const int N=100001;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int v[N],pd[N];
inline void integrare(int k,int &nr)
{
    int st=2,dr=nr,mij;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(pd[mij]>=k&&pd[mij-1]<k)
            {
                 pd[mij]=k;
                 return ;
            }
        else if(pd[mij]>k) dr=mij-1;
        else if(pd[mij]<k) st=mij+1;
    }
}
inline void stabilire(int k,int &nr)
{   if(k<pd[1]) pd[1]=k;
    else if(k<pd[nr]) integrare(k,nr);
    else if(k>pd[nr])
    {
        pd[++nr]=k;
    }
}
int main()
{
    int n,i;
    memset(pd,0x3f3f3f3f,sizeof(pd));
    fin>>n;
    for(i=1;i<=n;i++) fin>>v[i];
    pd[1]=v[1];
    int nr=1;
    for(i=2;i<=n;i++)
    {
        stabilire(v[i],nr);
    }
    fout<<nr<<"\n";
    for(i=1;i<=nr;i++) fout<<pd[i]<<" ";
}