#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;

ifstream cin("scmax.in");
ofstream cout("scmax.out");
int w[1005];
int main(){
    vector<int>v;
    int cnt = 0;
    int n;
    cin >> n;
    int x;
    for(int i = 1; i<= n; i++){
       cin >> x;
       v.push_back(x);
    }
    auto s = unique(v.begin(),v.end());
    v.erase(s,v.end());
    for(int i = 0; i < v.size(); i++){
        if(v[i]<=v[i+1]){
        w[cnt] = v[i];
           cnt++;
        }
    }
    cout << cnt << endl;
    for(int i=0; i < cnt; i++){
       cout <<w[i] << " ";
    }
   return 0;
}