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#include <iostream>

using namespace std;

int main() {

int n;
char c;
cin >> n;
cin.get(c);

int ones = 0;

for (int i = 0; i < 8*n; i++) {
	cin.get(c);
	if (c == '1')
		ones++;
}

if (ones >= 3*n && ones <= 6*n) {

	int ave = ones/n;
	int k = ones % n;

	switch(ave) {
		case 3:
			for (int i = 0; i < n - k; i++) {
				cout << 'a';
			}
			for (int i = 0; i < k; i++) {
				cout << 'c';
			}
			break;
		case 4:
			for (int i = 0; i < n - k; i++) {
				cout << 'f';
			}
			for (int i = 0; i < k; i++) {
				cout << 'm';
			}
			break;
		case 5:
			for (int i = 0; i < n - k; i++) {
				cout << 'm';
			}
			for (int i = 0; i < k; i++) {
				cout << 'o';
			}
			break;
		case 6:
			for (int i = 0; i < n; i++) {
				cout << 'w';
			}
			break;
	}

	cout << endl;

} else {
	cout << "NIE" << endl;
}
	return 0;
}