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#include <bits/stdc++.h>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);

    char c[7];
    for (char x='a'; x<='z'; ++x) {
        c[__builtin_popcount((int)(x))] = x;
    }

    int n;
    cin>>n;

    string s;
    cin>>s;

    int a=0;
    for (auto u : s) {
        if (u == '1') ++a;
    }
    
    if (a < 3*n) {
        cout<<"NIE\n";
    } else {
        int x[n];
        fill(x, x+n, 3);

        int cst = 3*n, i=0;

        while (cst < a && i < n) {
            if (x[i] == 6) ++i;
            else {
                ++x[i], ++cst;
            }
        }

        if (cst == a) {
            string ans;
            for (int i=0; i<n; ++i) ans += c[x[i]];

            cout<<ans<<"\n";
        } else {
            cout<<"NIE\n";
        }
    }
}