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#include <iostream>
#include <vector>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    int n, a = 0, b = 0;
    cin >> n;
    string res;
    
    for(int i = 0; i < 8 * n; ++i) {
        char c;
        cin >> c;
        if(c == '0') a++;
        else b++;
    }

    while(a > 0 & b > 0 && a != b) {
        if(a - b > 0) {
            a -= 5, b -= 3;
            res += 'a';
        } else if(a - b > -4) {
            a -= 3, b -= 5;
            res += 'g';
        } else {
            a -= 2, b -= 6;
            res += 'w';
        }
    }
    while(a > 0) {
        res += 'c';
        a -= 4, b -= 4;
    }
    if(a == 0 && b == 0) {
        cout << res << "\n";
    } else {
        cout << "NIE\n";
    }
}