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#include <bits/stdc++.h>

using namespace std;

int main()
{

    int n;
    cin >> n;
    string s;
    cin >> s;
    int zer = 0;
    int jed = 0;
    for (char x : s)
    {
        if (x =='0')zer++;
        if (x=='1')jed++;
    }
    
    string w;

    while (zer + jed >=8)
    {
        if (jed < zer)
        {
            jed -= 3;
            zer -= 5;
            w+='a';
            continue;
        }
        if (jed == zer)
        {
            jed -=4;
            zer -=4;
            w+='e';
            continue;
        }
        if (jed == 5 and zer ==3)
        {
            jed-=5;
            zer-=3;
            w+='k';
            continue;
        }
        if (jed > zer)
        {
            jed-=6;
            zer-=2;
            w+='o';
            continue;
        }

    }
    if (jed == 0 and zer ==0)
    cout << w << endl;
    else
    cout << "NIE"<<endl;
}

//4 , 3 , 5

/*

2

1100000011110111
*/