// tablajatek.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <queue>
#define ll long long

using namespace std;

ll sz = 0, m = 0, n, i, a;
deque <ll>x;

int main()
{
    cin >> n;
    for (i = 1; i <= n; ++i)
    {
        cin >> a;

        if (a == 0)
        {
            m = m * 2;
            sz = sz + 1;
        }

        if (a == 1)
        {
            m = m * 2 + 1;
            sz = sz + 1;
        }

        if (a == 2)
        {
            m = m / 2;
            --sz;
        }

        if (a == 3) m -= 1;
        if (a == 4) m += 1;
    }

    while (m)
    {
        x.push_front(m % 2);
        m = m / 2;
    }
    cout << sz << " " << endl;
    for (auto& e : x) cout << e;

    if (x.empty()) cout << 0;
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file