#include <iostream>
#include <fstream>
using namespace std;
ifstream fi("scmax.in");
ofstream fo("scmax.out");
int main()
{
    int n, m, i, ok=0, j, c=1, k, mn, v[100001], a[100001];
    fi>>n;
    fi>>v[1];
    mn=v[1];
    j=1;
    for (i=2; i<=n; i++)
    {
        fi>>v[i];
        if (v[i]<mn)
        {
            mn=v[i];
            j=i;
        }
    }
    k=j;
    a[c]=mn;
    m=mn;
    while (ok==0)
    {
        mn=2000000001;
        for (i=k+1; i<=n; i++)
        {
            if (v[i]<mn && v[i]!=m)
            {
                mn=v[i];
                j=i;
            }
        }
        if (k==j)
            ok=1;
        else
        {
            c++;
            a[c]=mn;
        }
        m=mn;
        k=j;
    }
    fo<<c<<endl;
    for (i=1; i<=c; i++)
        fo<<a[i]<<' ';
}