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#include <iostream>
#include <string_view>

struct zak_t
{
        uint32_t bytes;
        uint32_t num0;
        uint32_t num1;

        zak_t()
                : bytes(0)
                , num0(0)
                , num1(0)
        {}

        friend std::ostream& operator<<(std::ostream& out, zak_t const& zak)
        {
                out << zak.bytes << " [0:" << zak.num0 << ", 1:" << zak.num1 << "]\n";
                return out;
        }

        friend std::istream& operator>>(std::istream& in, zak_t& zak)
        {
                in >> zak.bytes;
                char c;
                for (std::size_t i = 0; i < 8*zak.bytes; ++i)
                {
                        in >> c;
                        if (c == '0')
                        {
                                zak.num0 += 1;
                        }
                        else
                        {
                                zak.num1 += 1;
                        }
                }
                return in;
        }
};

zak_t read_input(std::istream& input)
{
        zak_t zak;
        input >> zak;
        return zak;
}

char gen(uint32_t v)
{
        switch(v)
        {
                case 3: return 'a';
                case 4: return 'c';
                case 5: return 'g';
                case 6: return 'w';
        };
        return '0';
}

uint32_t solution(std::istream& input, std::ostream& out)
{
        auto zak = read_input(input);
        uint32_t result = 0;
        //out << zak;

        constexpr uint32_t min1 = 3;
        constexpr uint32_t max1 = 6;

        if (zak.bytes * min1 <= zak.num1 && zak.bytes * max1 >= zak.num1)
        {
                for(uint32_t i = zak.bytes; i > 0; --i)
                {
                        uint32_t avg = zak.num1 / i;
                        out << gen(avg);
                        zak.num1 -= avg;
                }
        }
        else
        {
                out << "NIE" ;
        }

        return result;
}

#ifndef TEST
int main(int argc, char* argv[])
{
        solution(std::cin, std::cout);
        return 0;
}
#endif