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#include <bits/stdc++.h>
using namespace std;
#define st first
#define nd second
#define iamspeed ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0)

int n, jed;
string s, res;
char t[5];

int main()
{
    iamspeed;
    cin >> n >> s;
    t[0] = 'a' ; t[1] = 'c' ; t[2] = 'g' ; t[3] = 'w';
    for(int i = 0 ; i < s.size() ; i++)
    {
        if(s[i] == '1') jed++;
    }
    jed -= n * 3;
    if(jed < 0)
    {
        cout << "NIE" << endl;
        return 0;
    }
    for(int i = 1 ; i <= n ; i++)
    {
        res += t[min(3, jed)];
        jed -= min(3, jed);
    }
    if(jed == 0) cout << res << endl;
    else cout << "NIE" << endl;

}