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#include <bits/stdc++.h>

using namespace std;

long long int n,ile,k;
char t;

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

    cin >> n;

    for(int i = 0 ; i < n*8; i++)
    {
        cin >> t;
        if(t=='1') ile++;
    }

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

    ile-=3*n;

    while(ile!=0)
    {
        if(ile>=3)
        {
            ile-=3;
            cout << "o";
            k++;
        }
        else if(ile==2) {cout << "g"; k++;ile=0;}
        else {cout << "c"; k++;ile=0;}
    }


    while(n-k>0)
    {
        cout << "a";
        k++;
    }



    return 0;
}