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

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n, j=0; string s, o;
	cin >> n;
	cin >> s;
	for(auto &&e : s)
		if(e == '1')
			++j;
	// {bin(ord(e)).count('1'): e for e in ascii_lowercase}
	while(n) {
		// cerr << j << ' ' << n << endl;
		switch(j/n) {
			case 3: o += "p"; j-=3; break;
			case 4: o += "x"; j-=4; break;
			case 5: o += "z"; j-=5; break;
			case 6: o += "w"; j-=6; break;
			default: cout << "NIE\n"; return 0;
		}
		--n;
	}
	if(j!=0) {cout << "NIE\n"; return 0;}
	cout << o << '\n';
	return 0;	
}