#include <fstream>
#include <algorithm>
using namespace std;
ifstream fi("scmax.in");
ofstream fo("scmax.out");
int n,A[100001],a,x;
int main()
{
    fi>>n;
    for(int i=1;i<=n;i++)
    {
        fi>>x;
        int *p=lower_bound(A+1,A+a+1,x);
        if(p==A+a+1)
            A[++a]=x;
        else
            A[p-A]=x;
    }
    fo<<a<<"\n";
    for(int i=1;i<=a;i++)
        fo<<A[i]<<" ";
    fi.close();
    fo.close();
    return 0;
}