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#include <bits/stdc++.h>
#include <cmath>

using namespace std;
int MAX_N = 100000;
int n, countOnes = 0;

char getCharFromOnes(int count) {
    if (count == 3) {
        return 'a';
    }
    else if (count == 4) {
        return 't';
    }
    else if (count == 5) {
        return 'y';
    }
    else if (count == 6) {
        return 'w';
    }
    
    return 0;
}


int main()
{
    cin.tie(nullptr);
    cout.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    string in;
    cin >> n;
    cin >> in;
    for (int i = 0; i < 8 * n; ++i) {
        if (in[i] == '1') {
            countOnes++;
        }
    }
    
    if (countOnes < 3 * n || countOnes > 6 * n) {
        cout << "NIE\n";
        return 0;
    }
    
    string result = "";
    double onesPerWord = (double)countOnes / (double)n;
    if (onesPerWord == ceil(onesPerWord)) {
        for (int i = 0; i < n; ++i) {
            result += getCharFromOnes(onesPerWord);
        }
    }
    else {
        double whole, fractional;
        fractional = modf(onesPerWord, &whole);
        int toAdd = (fractional * n);
        for (int i = 0; i < n - toAdd; ++i) {
            result += getCharFromOnes(whole);
        }
        for (int i = 0; i < toAdd; ++i) {
            result += getCharFromOnes(whole + 1);
        }
    }
    
    cout << result << '\n';
    return 0;
}