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#include <iostream>
#include <string>

using namespace std;


bool decode(const string &input, string &output, int len) {
    int zeros = 0, ones = 0, pos = 0;

    for(int i=0; i<8*len; ++i) {
        if(input[i] == '0')
            ++zeros;
        else
            ++ones;
    }

    if(zeros > ones) {
        int numCh = (zeros-ones) >> 1;

        output.append(numCh, 'a');
        zeros -= 5*numCh;
        ones -= 3*numCh;

        if(zeros < 0 || ones < 0 || zeros%4 != 0 || ones%4 != 0)
            return false;

        output.append((zeros >> 2), 'c');

        return true;
    }
    
    if(ones > zeros) {
        int diff = ones - zeros;
        
        for(int quads=0; quads<= (diff>>2); ++quads) {
            int dbls = (diff-(quads<<2))>>1;
            int remZeros = zeros - quads*2 - dbls*3;
            int remOnes = ones - quads*6 - dbls*5;

            if(remZeros != remOnes || remZeros < 0 || remOnes < 0 || remZeros % 4 || remOnes % 4)
                continue;

            int equals = remZeros / 4;

            if(quads + dbls + equals == len) {
                output.append(quads, 'o');
                output.append(dbls, 'g');
                output.append(equals, 'c');

                return true;
            }
        }

        return false;
    }

    output.append((zeros >> 2), 'c');

    return true;
}


int main() {
    string input, output;
    int n;

    ios::sync_with_stdio(false);

    cin >> n >> input;

    if(decode(input, output, n)) 
        cout << output << endl;
    else
        cout << "NIE" << endl;    

    return 0;
}