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#include <iostream>
#include <vector>
#include <string>

int main() {
    std::ios::sync_with_stdio(false);
    int n;
    std::cin >> n;
    std::string s;
    std::cin >> s;
    int k = 0;
    for (int i = 0; i < s.length(); ++i) {
        if (s[i] == '1') ++k;
    }

    if ((k < 3 * n) || (k > 6 * n)) {
        std::cout << "NIE";
        return 0;
    }

    while (n > 0) {
        int chars = k / n;
        k -= chars;
        n--;
        if (chars == 3) std::cout << 'a';
        else if (chars == 4) std::cout << 'c';
        else if (chars == 5) std::cout << 'g';
        else if (chars == 6) std::cout << 'o';
    }

    return 0;
}