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#include <iostream>
#include <stdint.h>

using namespace std;

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

    uint32_t n;
    uint64_t licz1=0;
    cin>>n;
    for (uint32_t ii=0; ii<8*n; ii++)
    {
        char bit;
        cin>>bit;
        if(bit=='1')
            licz1++;
    }

    if (licz1 < 3*n || licz1 > 6*n)
    {
        cout<<"NIE"<<endl;
        return 0;
    }

    for (uint64_t ii=1; ii<=n; ii++)
    {
        uint32_t bityNaLiterke = (ii*licz1)/n - ((ii-1)*licz1)/n;
        switch (bityNaLiterke)
        {
            case 3:
                cout<<'a';
                break;
            case 4:
                cout<<'c';
                break;
            case 5:
                cout<<'g';
                break;
            case 6:
                cout<<'o';
                break;
        }
    }
    cout<<endl;

    return 0;
}