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

int main(){
    int n; 
    string s; 
    cin>>n>>s; 
    int jeden = 0, zero = 0; 

    for (auto lit:s){
        if (lit == '1')
            jeden++; 
        else 
            zero++;
    }

    jeden -= n*3; 
    zero -= n*2; 

    if (jeden < 0 || zero < 0){
        cout<<"NIE"<<endl; 
        return 0; 
    }

    int l4 = 0; 
    l4 += jeden/3; 
    jeden -= jeden%3; 

    for (int i = 0; i < l4; i++)
        cout<<'o'; 
    if (jeden == 2)
        cout<<'m'; 
    if (jeden == 1)
        cout<<'f'; 
    else 
        cout<<'d'; 

    for (int i = 0; i < n-l4-1; i++)
        cout<<'a'; 

    cout<<endl; 

}