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///MEMENTO MEMO, MEMENTO LONG LONG
#include <bits/stdc++.h>

#define DEBUG if(1)
#define COUT cout << "\e[36m"
#define ENDL "\e[39m" << endl
#define VAR(v) " [\e[32m" << #v << "\e[36m=\e[91m" << v << "\e[36m] "

using namespace std;

typedef long long LL;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int bytes;
    cin >> bytes;
    int ones = 0;
    for (int i = 0; i < bytes*8; ++i)
    {
        char ch;
        cin >> ch;
        if(ch == '1')
        {
            ones++;
        }
    }

    char bits_to_char[] = {'?', '?', '?', 'a', 'c', 'g', 'o'};
    int min_bits_per_byte = ones/bytes;
    int excess = ones - bytes*min_bits_per_byte;
    if(bytes*3 <= ones && ones <= bytes*6)
    {
        for (int i = 0; i < bytes; ++i)
        {
            if(i < excess)
            {
                cout << bits_to_char[min_bits_per_byte+1];
            } else
            {
                cout << bits_to_char[min_bits_per_byte];
            }
        }
        cout << "\n";
    }
    else
    {
        cout << "NIE\n";
    }

}