#include <bits/stdc++.h>
#define N 100001
using namespace std;

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

int n, a[N], b[N], k;

void citire(){
    fin>>n;
    for(int i = 1; i <= n; ++i)
        fin>>a[i];
}

void alg(){
    for(int i = 2; i <= n; ++i){
        if(a[i] > a[i-1] && a[i-1] != b[k] && a[i]!=a[i-1]){
            ++k;
            b[k] = a[i-1];
        } else if(a[i] != a[i-1]){
            ++k;
            b[k] = a[i];
        }
    }
}

void afisare(){
    fout<<k<<"\n";
    for(int i = 1; i <= k; ++i)
        fout<<b[i]<<" ";
}


int main(){
    citire();
    alg();
    afisare();
}