Tanya and Stairways

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define IOS ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
// #define ios ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
const int N = 1e4 + 10;
ll a[N];
void solve()
{
	ll n,sum=0;
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>a[i];
		if(a[i]==1) sum++;
	}
	cout<<sum<<endl;
	for(int i=2;i<=n;i++)
		if(a[i]==1) cout<<a[i-1]<<" ";
	cout<<a[n]<<endl;
}
int main()
{
	IOS
	solve();
	return 0;
}