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#include <bits/stdc++.h>

using namespace std;

struct lol {
    int zero;
    int one;
};
lol frajer[100007];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    int count0=0, count1=0;
    char a;
    cin >> n;
    for(int i = 0; i < n; i++) {
        frajer[i].zero=2;
        frajer[i].one=6;
    }

    for(int i = 0; i < n*8; i++) {
        cin >> a;
        if (a == '0') {
            count0++;
        } else {
            count1++;
        }
    }
    int mcount0=2*n, mcount1=6*n;
    // cout << mcount0 << " " << mcount1 << endl;
    int it = n-1;
    while(mcount0 != count0 && mcount1 != count1 && it >= 0) {
        if (frajer[it].zero == 5) {
            it--;
        } else {
            frajer[it].zero++;
            frajer[it].one--;
            mcount0++;
            mcount1--;
        }
    }
    if (mcount0 != count0 || mcount1 != count1 || it < 0) {
        cout << "NIE";
        return 0;
    }
    for(int i = 0; i < n; i++) {
        switch(frajer[i].zero) {
            case 2:
                cout << "o";
                break;
            case 3:
                cout << "n";
                break;
            case 4:
                cout << "c";
                break;
            case 5:
                cout << "a";
                break;
        }
    }
    // cout << mcount0 << " " << mcount1 << " " << it << endl;
    return 0;
}