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#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define ll long long
#define ull unsigned long long
//#define int LL
#define FOR(i,a,b) for(int i = (a); i <= (b); i++)
#define REP(i,n) FOR(i,0,(int)(n)-1)
#define VI vector<int>
#define VVI vector<VI>
#define PII pair<int, int>
#define PLL pair<ll, ll>
#define st first
#define nd second
#define ALL(x) (x).begin(), (x).end()
#define SZ(x) ((int)x.size())

template<class C> void mini(C& x, C y) { x = min(x,y); }
template<class C> void maxi(C& x, C y) { x = max(x,y); }

template<class TH> void _dbg(const char *sdbg, TH h){ cerr<<sdbg<<'='<<h<<endl; }
template<class TH, class... TA> void _dbg(const char *sdbg, TH h, TA... a) {
	while(*sdbg!=',') cerr<<*sdbg++;
	cerr<<'='<<h<<','; _dbg(sdbg+1, a...);
}

template<class T> ostream &operator<<(ostream& os, vector<T> V) {
	os << "["; for (auto vv : V) os << vv << ","; return os << "]";
}
template<class L, class R> ostream &operator<<(ostream &os, pair<L,R> P) {
	return os << "(" << P.st << "," << P.nd << ")";
}

#ifdef LOCAL
#define debug(...) _dbg(#__VA_ARGS__, __VA_ARGS__)
#else
#define debug(...) (__VA_ARGS__)
#define cerr if(0)cout
#endif

int n;
string s;

char t[9];

signed main() {
	ios_base::sync_with_stdio(false); cin.tie(nullptr);

	t[0] = t[1] = t[2] = '$';
	t[3] = 'a';
	t[4] = 'c';
	t[5] = 'g';
	t[6] = 'o';
	t[7] = t[8] = '$';

	cin >> n >> s;

	int ones = 0;
	for(char c : s) {
		if(c == '1') ones++;
	}

	if(ones > 6*n or ones < 3*n) {
		cout << "NIE";
		return 0;
	}

	while(n > 0) {
		int k = ones/n;
		cout << t[k];
		ones -= k;
		n--;
	}




	return 0;
}