#include <bits/stdc++.h>
using namespace std;

int n;
char a;
int ill;

char lit[7]={'e','s','s','a','c','g','o'};

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    
    cin >> n;
    for(int i=0;i<n*8;i++)
    {
        cin >> a;
        ill+=a-'0';
    }
    if(n*3>ill || n*6<ill)
    {
        cout << "NIE";
        return 0;
    }
    ill-=n*3;
    for(int i=0;i<n;i++)
    {
        if(ill<3)
        {
            cout << lit[ill+3];
            ill=0;
        }
        else
        {
            cout << lit[6];
            ill=ill-3;
        }
    }


    return 0;
}