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

string z = "acgw";

int main()
{
    ios_base::sync_with_stdio(0);
    int n, q[2]{};
    cin >> n;
    string s;
    cin >> s;
    for (auto i : s)
    {
        q[i - '0']++;
    }
    q[0] -= n;
    q[1] -= n * 2;
    if (min(q[0], q[1]) < 0)
    {
        cout << "NIE";
        return 0;
    }
    // cout << q[0] << ' ' << q[1];
    for (int i = 0; i <= n; i++)
    {
        pair<int, int> x = {q[0], q[1]};
        x.first -= 4 * i;
        x.second -= i;
        if (min(x.first, x.second) < 0)
        {
            continue;
        }
        int rem = n - i;
        if (x.first >= x.second)
        {
            int diff = x.first - x.second;
            x.first -= diff * 3;
            x.second -= diff * 2;
            // cout<<"P";
            if (min(x.first, x.second) < 0)
                continue;
            if ((x.first % 5) || (x.second % 5))
                continue;
            for (; i; i--)
                cout << "a";
            while (diff--)
                cout << "c";
            x.first += 5;
            while (x.first -= 5)
                cout << "cg";
            return 0;
        }
        else
        {
            // cout<<"P";
            int diff = x.second - x.first;
            x.first -= diff * 2;
            x.second -= diff * 3;
            if (min(x.first, x.second) < 0)
                continue;
            if ((x.first % 5) || (x.second % 5))
                continue;
            for (; i; i--)
                cout << "a";
            while (diff--)
                cout << "g";
            x.first += 5;
            while (x.first -= 5)
                cout << "cg";
            return 0;
        }
    }
    for (int i = 0; i <= n; i++)
    {
        pair<int, int> x = {q[0], q[1]};
        x.first -= i;
        x.second -= i * 4;
        if (min(x.first, x.second) < 0)
        {
            continue;
        }
        int rem = n - i;
        if (x.first >= x.second)
        {
            int diff = x.first - x.second;
            x.first -= diff * 3;
            x.second -= diff * 2;
            if (min(x.first, x.second) < 0)
                continue;
            if ((x.first % 5) || (x.second % 5))
                continue;
            for (; i; i--)
                cout << "w";
            while (diff--)
                cout << "c";
            x.first += 5;
            while (x.first -= 5)
                cout << "cg";
            return 0;
        }
        else
        {
            int diff = x.second - x.first;
            x.first -= diff * 2;
            x.second -= diff * 3;
            if (min(x.first, x.second) < 0)
                continue;
            if ((x.first % 5) || (x.second % 5))
                continue;
            for (; i; i--)
                cout << "w";
            while (diff--)
                cout << "g";
            x.first += 5;
            while (x.first -= 5)
                cout << "cg";
            return 0;
        }
    }
    cout << "NIE";
}