#include <fstream>
using namespace std;
ifstream cin("scmax.in");
ofstream cout("scmax.out");
int n,x,v[100002],m,dp[100002],t[100002];
void rec(int x){
    if(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=m,poz=0;
        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==0)
            dp[++m]=i,t[i]=dp[m-1];
        else
            dp[poz]=i,t[i]=dp[poz-1];
    }
    cout<<m<<'\n';
    rec(dp[m]);
    return 0;
}