#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k = 0;
  cin >> n;
  int a[n];
  for (int i = 0; i < n; i++) cin >> a[i];
  int count = 0;
  for (int i = 0; i < n; i++) {
    if (a[i] == 1) {
      count++;
    }
  }
  cout << count << endl;
  for (int i = 1; i < n; i++) {
    if (a[i] == 1) {
      cout << i - k << " ";
      k = i;
    }
  }
  cout << n - k;
}
