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#include <iostream>
#include <string>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    string t="xxxacgoxx";

    int n;
    string s;
    cin>>n>>s;

    int ile=0;
    for (int i=0; i<s.length(); ++i)
        ile+=s[i]-'0';

    if (t[ile/n]=='x' || t[(ile+n-1)/n]=='x')
    {
        cout<<"NIE\n";
        return 0;
    }

    while (n)
    {
        int x=ile/n;
        cout<<t[x];
        ile-=x;
        --n;
    }
    cout<<endl;
    return 0;
}