#include <fstream>
#define nmax (int)(1e5+1)
using namespace std;
ifstream cin("scmax.in");
ofstream cout("scmax.out");
int n,v[nmax],dp[nmax],t[nmax],k;
void rec(int x){
    if(t[x]!=0)
        rec(t[x]);
    cout<<v[x]<<" ";
}
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>v[i];
        int st=1,dr=k,p=k+1;
        while(st<=dr){
            int mid=(st+dr)/2;
            if(v[dp[mid]]>=v[i])
                p=mid,dr=mid-1;
            else
                st=mid+1;
        }
        t[i]=dp[p-1];
        dp[p]=i;
        if(p==k+1)
            k++;
    }
    cout<<k<<'\n';
    rec(dp[k]);
    return 0;
}