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

void debug(){cerr<<"\n";}
template <typename H, typename... T>
void debug(H h, T... t) {cerr<<h; if (sizeof...(t)) cerr << ", "; debug(t...);}
#define deb(x...) cerr<<#x<<" = ";debug(x);
 
void solve()
{
    //3 - a, 4 - e, 5 - k, 6 - w
    int n;
    cin >> n;
    string s;
    cin >> s;
    int one = 0;
    int zero = 0;
    for(auto a : s) {
        if(a == '0') zero++;
        else one++;
    }
    vector <char> vec(4);
    vec[0] = 'a';
    vec[1] = 'e';
    vec[2] = 'k';
    vec[3] = 'w';
    long double avarage = 1.0 * one / n;
    if(avarage >= 3 and avarage <= 6) {
        int num = avarage;
        long double rest = 1.0 * (avarage - num) * n;
        for(int i = 0;i < n-rest; i++) {
            cout << vec[num-3];
        }
        for(int i = 0;i < rest; i++) {
            cout << vec[num-2];
        }
    }
    else { 
        cout << "NIE";
    }
}
 
int main()
{
	ios::sync_with_stdio(false); cin.tie(nullptr);
    int tt = 1;
    //cin >> tt;
    for(int case_num = 1; case_num <= tt; case_num++){
        //cout << "Case #" << case_num << ": ";
        solve();
        cout << "\n";
    }
 
    return 0;
}