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#include <bits/stdc++.h>

using namespace std;

int n;
string s;

void solve() {
    int b = 0;
    for(int i=0;i<n*8;i++){
        if(s[i]=='1'){
            b++;
        }
    }
    if(b<n*3 || b >n*6) {
        cout<<"NIE\n";
        return;
    }
    b-=3*n;

    int ile = 0;
    while(b>=3) {
        cout<<'o';
        ile++;
        b-=3;
    }
    while(b>=2) {
        cout<<'g';
        ile++;
        b-=2;
    }
    while(b>=1) {
        cout<<'c';
        ile++;
        b-=1;
    }
    while(ile<n){
        cout<<'a';
        ile++;
    }
    return;
}

int main() {
    ios_base::sync_with_stdio(false);

    cin>>n>>s;
    solve();
    //cout<<solve() <<"\n";

    return 0;
}