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#include <iostream>

int main() {
    int n;
    std::cin >> n;
    int d = 0;
    for (int i = 0; i < 8 * n; ++i) {
        char c;
        std::cin >> c;
        if (c == '1') {
            d += 1;
        }
    }

    if (d < 3 * n || d > 6 * n) {
        std::cout << "NIE\n";
    } else {
        while (n > 0) {
            if (d < 4 * n) {
                std::cout << "a";
                d -= 3;
            } else if (d < 5 * n) {
                std::cout << "f";
                d -= 4;
            } else if (d < 6 * n) {
                std::cout << "m";
                d -= 5;
            } else if (d == 6 * n) {
                std::cout << "w";
                d -= 6;
            } else {
                throw "lol";
            }

            n -= 1;
        }
        std::cout << "\n";
    }
}