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#include<bits/stdc++.h>

using namespace std;

int n, sex;
string s;

string ahyesveryfastbrr(string z, int number)
{
    if(number < 0 || z.size() > n) return "";
    if(z.size() == n && number == 0) return z;

    if(ahyesveryfastbrr(z+"3", number-3) != "") return ahyesveryfastbrr(z+"3", number-3);
    if(ahyesveryfastbrr(z+"4", number-4) != "") return ahyesveryfastbrr(z+"4", number-4);
    if(ahyesveryfastbrr(z+"5", number-5) != "") return ahyesveryfastbrr(z+"5", number-5);
    if(ahyesveryfastbrr(z+"6", number-6) != "") return ahyesveryfastbrr(z+"6", number-6);

    return "";
}

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(0);

    cin >> n >> s;

    for(int i = 0; i < s.size(); i++)
    {
        if(s[i] == '1') sex++;
    }

    if(sex/ 3 < n)
    {
        cout << "NIE";
        return 0;
    }

    string essa = ahyesveryfastbrr("", sex);

    if(essa != "")
    {
        for(int i = 0; i < essa.size(); i++)
        {
            if(essa[i] == '3') cout << 'a';
            else if(essa[i] == '4') cout << 'c';
            else if(essa[i] == '5') cout << 'g';
            else if(essa[i] == '6') cout << 'o';
        }

        return 0;
    }

    cout << "NIE";
}