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#include <iostream>
#include <string>


std::string solution() {
    int n;
    std::cin >> n;

    std::string input;
    std::cin >> input;

    int zeros = 0;
    int ones = 0;
    for (int i = 0; i < 8 * n; ++i) {
        if (input[i] == '0') ++zeros;
        else if (input[i] == '1') ++ones;
        else exit(1);
    }

    if (zeros < 2 * n || zeros > 5 * n) {
        return {};
    }

    std::string ans = "";

    while (zeros > ones) {
        ans += 'a';
        zeros -= 5;
        ones -= 3;
    }

    while (ones > zeros) {
        if (ones - zeros >= 4) {
            ans += 'o';
            ones -= 6;
            zeros -= 2;
        }
        else if (ones - zeros == 2) {
            ans += 'n';
            ones -= 5;
            zeros -= 3;
        }
    }

    while (ones > 0) {
        ans += 'e';
        ones -= 4;
    }

    return ans;
}

int main() {
    std::string ans = solution();
    if (ans.length() == 0) {
        std::cout << "NIE\n";
    }
    else {
        std::cout << ans << "\n";
    }
    return 0;
}