#include <fstream>
#define nmax (int)(1e7+1)
using namespace std;
ifstream cin("scmax.in");
ofstream cout("scmax.out");
int dp[nmax],n,m,v[nmax],t[nmax];
void rec(int n){
    if(t[n]!=0)
        rec(t[n]);
    cout<<v[n]<<" ";
}
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>v[i];
        int st=1,dr=m,poz=m+1;
        while(st<=dr){
            int mid=(st+dr)/2;
            if(v[dp[mid]]>=v[i]){
                poz=mid;
                dr=mid-1;
            }else
                st=mid+1;
        }
        if(poz==m+1)
            m++;
        t[i]=dp[poz-1];
        dp[poz]=i;
    }
    cout<<m<<'\n';
    rec(dp[m]);
    return 0;
}