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#include <cstdio>
#include <cstdlib>

#include <iostream>

#include <cassert>

char buffer[100 * 1000 + 1];

int main() {
    int n;
    std::cin >> n;

    int ones = 0;

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

    if (ones < 3 * n || ones > 6 * n) {
        printf("NIE\n");
        return 0;
    }

    ones -= 3 * n;

    for (int i = 0; i < n; i++) {
        if (ones >= 3) {
            buffer[i] = 'o';
            ones -= 3;
        } else {
            if (ones == 2) {
                buffer[i] = 'g';
            } else if (ones == 1) {
                buffer[i] = 'c';
            } else {
                buffer[i] = 'a';
            }
            ones = 0;
        }
    }

    buffer[n] = '\0';
    puts(buffer);

    assert(ones == 0);

    return 0;
}