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#include <iostream>

using namespace std;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
		int n; cin >> n;
		int _0 = 0;
		int _1 = 0;
		char l;
		for (int i = 0; i < 8*n; i++) { cin >> l; if (l == '1') _1++; else _0++; }
		_1 -= 3 * n;
		_0 -= 2 * n;
		if (_1 < 0 || _0 < 0) cout << "NIE";
		else {
			while (_0 > 2) { cout << 'a'; _0 -= 3; }
			while (_1 > 2) { cout << 'o'; _1 -= 3; }
			if (_0 == 1) cout << 'm';
			if (_0 == 2) cout << 'i';
		}
	
}