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#include <bits/stdc++.h>
using namespace std;
#define true rand()%2
 
#define ll long long
#define p_b push_back
#define m_p make_pair
#define fi first
#define se second
 
ll inf = 1000000007;
ll mod = 1000000007;
const int maxn = 1048579;

char c[7];

int main(){
    ios_base::sync_with_stdio(0);
    int n; cin>>n;
    int np = n*8;
    string s; cin>>s;
    int lz = 0;
    for(auto i: s)
        if(i=='1')
            lz++;

    int mi = lz/n, ma = lz/n;
    if(lz%n) ma++;
    c[3] = 'a';
    c[4] = 'c';
    c[5] = 'g';
    c[6] = 'o';
    if(3<=mi && ma<=6){
        int ima = lz%n;
        for(int i = 0; i<ima; i++)
            cout<<c[ma];

        for(int i = ima; i<n; i++)
            cout<<c[mi];
    }
    else cout<<"NIE";
}