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#include <bits/stdc++.h>
using namespace std;
 
typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef pair<ll, int> PILL;
typedef pair<ll, ll> PLL;
 
const int MAX_N = 1e6+5;
const int M = 3e4+5;
const ll INF = (ll)(1e18);
const int inf = 1e9;
const ll MOD = 1000000007LL;

// a: 3 ones
// c: 4 ones
// g: 5 ones
// w: 6 ones

int n;
string s;
 
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
	
	cin >> n >> s;
	
	int ones = 0;
	for (int i = 0; i < 8 * n; i++) {
		if (s[i] == '1') ones++;
	}
	
	if (ones < 3*n || ones > 6*n) {
		cout << "NIE\n";
		return 0;
	}
	
	string ans = "";
	ones -= 3*n;
	for (int i = 0; i < n; i++) {
		ans += 'a';
	}
	
	for (int i = 0; i < n; i++) {
		if (ones <= 0) break;
		
		if (ones >= 3) {
			ones -= 3;
			ans[i] = 'w';
			continue;
		} 
		
		if (ones == 2) {
			ans[i] = 'g';
			break;
		}
		
		if (ones == 1) {
			ans[i] = 'c';
			break;
		}
	}
	
	cout << ans << '\n';
	
    return 0;
}