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#include <bits/stdc++.h>

using namespace std;
typedef long long LL;

int main() {
    ios_base::sync_with_stdio(false);
    int n = 0, i = 0;
    cin >> n;
    int ones = 0, zeros = 0;
    n *= 8;

     while(i < n) {
        char c;
        cin >> c;
        if(c == '0') ++zeros, ++i;
        if(c == '1') ++ones, ++i;
    }


    string str = "";

    while(zeros > 0 && ones > 0) {
        if(zeros > ones) {
            str.push_back('a');
            zeros -= 5;
            ones -= 3;
        } else if(zeros == ones) {
            str.push_back('x');
            zeros -= 4;
            ones -= 4;
        } else {
            if(ones-zeros >= 4) {
                str.push_back('w');
                zeros -= 2;
                ones -= 6;
            } else {
                str.push_back('y');
                zeros -= 3;
                ones -= 5;
            }
        }
    }
    
    if(zeros == 0 && ones == 0) {
        cout << str << endl;
    } else {
        cout << "NIE" << endl;
    }
}