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#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define ll long long
#define vi vector<int>
#define vvi vector<vi>
#define vll vector<ll>
#define mp make_pair
#define fi first
#define se second
#define PII pair<int,int>
#define vPII vector<PII>
const ll MAXN = 3e5+5;

int n, zeroes, ones, c;
string s;
vi v;

// 011 + co najmniej 1 zero i jedynka
// 011 01 ___
// 104 + 4_ + 2_ + _

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> s;
    for (int i = 0; i < 8*n; ++i) {
        c = (int)s[i] - '0';
        if (c == 1 && ones < 3*n) ones++;
        else if (c == 0 && zeroes < 2*n) zeroes++;
        else v.push_back(c);
    }
    if (v.size() != 3*n) {
        cout << "NIE";
        return 0;
    }
    for (int i = 0; i < n; ++i)
        cout << (char)(104 + 4*v[3*i] + 2*v[3*i+1] +v[3*i+2]);
}