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#include <iostream>
#include <bitset>

#define MAX 500001

using namespace std;
typedef long long ll;

int main() {
    ios_base::sync_with_stdio(false);

    int n;
    string bits;
    cin >> n;
    cin >> bits;

    int zeros = 0;
    int ones = 0;
    for (const auto &bit: bits) {
        if (bit == '0') zeros += 1;
        if (bit == '1') ones += 1;
    }

//    cout << bits << endl;
//    cout << zeros << endl << ones << endl;

    if (zeros < n * 2 || zeros > n * 5 || ones < n * 3 || ones > n * 6) {
        cout << "NIE";
    } else {
        while (zeros != 0 || ones != 0) {
            if (zeros == 3 && ones == 5) {
                cout << 's';
                zeros -= 3;
                ones -= 5;
            } else if (zeros > ones) {
                cout << 'a';
                zeros -= 5;
                ones -= 3;
            } else if (ones > zeros) {
                cout << 'w';
                zeros -= 2;
                ones -= 6;
            } else {
                cout << 'c';
                zeros -= 4;
                ones -= 4;
            }
        }
    }

    return 0;
}