#include <bits/stdc++.h>
using namespace std;
#define ll long long
void harmasba(ll num)
{   if(num == 0){
    return;
    }
    int x = num % 3;
    num /= 3;
    harmasba(num);

    cout << x;
}
int main()
{
    int n; cin >> n;
    vector <int> S(n);
    for(int i = 0; i < n; i++) cin >> S[i];
    ll ans = 0;
    vector <int> steps;
    for(int i = 0; i < n; i++){
        if(S[i] >= 0 && S[i] <= 2){
            ans++;
            steps.push_back(S[i]);
        }
        else if(S[i] == 3){
            ans--;
            steps.pop_back();
        }
        else if(S[i] == 4){
            steps.push_back(4);
        }
        else steps.push_back(5);
    }
    cout << ans << "\n";
    ll num = 0;
    for(int i = 0; i < steps.size(); i++){
        if(steps[i] == 0){
            num*=3;
        }
        else if(steps[i] = 1){
            num *= 3;
            num += 1;
        }
        else if(steps[i] == 2){
            num*=3;
            num+=2;
        }
        else if(steps[i] == 4) num--;
        else if(steps[i] == 5) num++;
    }
    harmasba(num);
    return 0;
}