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#include<bits/stdc++.h>
using namespace std;
#define d(a)cout<<#a<<" = "<<a<<"\n";
#define f first
#define s second
#define mp make_pair
#define TURBO ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ll long long
#define MAXN 100100
#define ADD 500500
string ans;
/*
 3-a ->-2
 4-c ->0
 5-k ->2
 6-o ->4
 */
int n,zero;//o-ones,z-zeros

int main(){
    TURBO;
    cin>>n;
    string in;
    cin>>in;
    for(auto i:in)
        if(i=='0')zero++;
    int diff=8*n-zero-zero;
    //d(zero);
    if(diff%2!=0){
        ans="NIE";
    }
    else{
        int need=0;
        while (need<n) {
            //d(diff);d(ans);
            need++;
            if(diff>=4){
                ans+="o";
                diff-=4;
            }
            else if(diff==2){
                ans+="k";
                diff-=2;
            }
            else if(diff<0){
                ans+="a";
                diff+=2;
            }
            else if(diff==0){
                ans+="c";
            }
        }
        if(diff)ans="NIE";
    }
    cout<<ans+"\n";
}