#include <fstream>

using namespace std;
ifstream cin("scmax.in");
ofstream cout("scmax.out");
int v[100001], dp[100001],n,k,i,tata[100001];
void reconst(int k){
    if(k>0){
        reconst(tata[k]);
        cout<<v[k]<<" ";
    }
}
int main()
{
    cin>>n;
    for(i=1;i<=n;i++)
        cin>>v[i];
    for(int i=1;i<=n;i++){
        int st=1, dr=k;
        while(st<=dr){
            int mid=(st+dr)/2;
            if(v[i]<=v[dp[mid]])
                 dr=mid-1;
            else
              st=mid+1;
        }
        if(st>k)
            k++;
        dp[st]=i;
        tata[i]=dp[st-1];
        
    }    
    cout<<k<<"\n";
    reconst(dp[k]);

    return 0;
}