# include <fstream>
# include <iostream>
# include <algorithm>
# include <cstring>
using namespace std;
ifstream fi("scmax.in");
ofstream fo("scmax.out");
const int nmax=100005;
const int infi=1<<30;
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;
    }
    int p=n;
    while (s[p]!=MAX) --p;
    int k=0;
    while (p)
    {
        v[++k]=S[p];
        for (int i=p-1;i>=0;--i)
             if (s[i]==s[p]-1 && S[i]<S[p])
        {
            p=i;break;
        }
    }
    fo<<MAX<<"\n";
    while (MAX--) fo<<v[MAX]<<" ";
    fo<<"\n";
    fo.close();
    return 0;
}