#include <iostream>
#include <fstream>
#define Nmax 100001

using namespace std;

ifstream f("scmax.in");
ofstream g("scmax.out");

int n, v[Nmax], s[Nmax], k;

int main()
{
    f>>n;
    for(int i=1;i<=n;i++)
    {
        f>>v[i];
    }
    for(int i=1;i<=n;i++)
    {
        while(k>0 && s[k]>=v[i])
            k--;
        s[++k]=v[i];
    }
    g<<k<<'\n';
    for(int i=1;i<=k;i++)
        g<<s[i]<<" ";
    return 0;
}