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#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ull  unsigned long long
#define s second
#define f first
#define mp make_pair
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    char x;
    cin>>n;
    int ones=-n*3;
    for (int i = 0; i < n*8; i++)
    {
        cin>>x;
        if(x=='1')   ones++;  
    }
    // 8 4 2 1 a,c,g,o
    //cout<<ones<<" "<<n<<"\n";
    if((ones<0) || (ones>(n*3)))
    {
        cout<<"NIE";
        return 0;
    }
    string ss;
    for (int i = 0; i < n; i++)
    {
        if(ones>=3){ones-=3;ss.push_back('o');}
        else if(ones>=2){ones-=2;ss.push_back('g');}
        else if(ones>=1){ones-=1;ss.push_back('c');}
        else ss.push_back('a');
    }
    cout<<ss;
    
}