#include <bits/stdc++.h>

using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");

int n,a[100001],l[100001],nl,urm[100001];
int main()
{
    fin>>n;
    for(int i=1;i<=n;i++)
        fin>>a[i];

    l[1]=n;
    urm[n]=n+1;
    nl=1;

    for(int i=n-1;i>0;i--)
    {
        if(a[i]<a[l[nl]])
        {
            nl++;
            l[nl]=i;
            urm[i]=l[nl-1];
        }
        else if( a[i]>=a[l[1]])
        {
            l[1]=i;
            urm[i]=n+1;
        }
        else
        {
            int st=1,dr=nl-1,mij,gasit=0;
            while(!gasit)
            {
                mij=(st+dr)/2;
                if(a[l[mij]]>a[i] && a[i]>=a[l[mij+1]] )
                {
                    gasit=1;
                    l[mij+1]=i;
                    urm[i]=l[mij];
                }
                else if(a[l[mij]]<=a[i])
                    dr=mij-1;
                else
                    st=mij+1;
            }

        }
    }
    fout<<nl<<'\n';
    int p=l[nl];
    while(p<=n)
    {
        fout<<a[p]<<" ";
        p=urm[p];
    }
    return 0;
}