# include <fstream>
# include <iostream>
# include <algorithm>
# include <cstring>
# define max(a,b) ( (a) > (b) ? (a) : (b) )
# define infi (1LL<<31)-1
# define nmax 100005
using namespace std;
ifstream fi("scmax.in");
ofstream fo("scmax.out");
int S[nmax],V[nmax],s[nmax],v[nmax];
int read()
{
    char c[30];
    fi>>c;
    int k=strlen(c),p=0;
    for (int i=0;i<k;++i) p=p*10+c[i]-'0';
    return (p);
}
int main(void)
{
    int n=read();
    for (int i=1;i<=n;++i) S[i]=read();
    int MAX=0;
    for (int i=1;i<=n;++i)
    {
        V[i]=infi;
        int low=lower_bound(V+1,V+1+i,S[i])-V;
        V[low]=S[i];
        s[i]=low;
        if (low>MAX) MAX=low;
    }
    fo<<MAX<<"\n";
    for (int i=n,j=MAX;i && j;--i)
        if (s[i]==j)
           v[j]=S[i],--j;
    for (int i=1;i<=MAX;++i) fo<<v[i]<<" ";
    fo<<"\n";
    fo.close();
    return 0;
}