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

int n;
string s;
string result;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin >> n >> s;
    int count = 0;

    for (char c : s)
        if (c == '1')
            ++count;

    if (count < 3 * n || count > 6 * n)
    {
        cout << "NIE\n";
        return 0;
    }
    
    result = "";
    for (int i = 0; i < n; ++i)
        result += 'a';
    count -= 3 * n;

    for (int i = 0; i < n && count; ++i)
    {
        int added = min(3, count);
        count -= added;
        result[i] += (((1 << added) - 1) << 1);
    }

    cout << result << "\n";

    return 0;
}