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#include <bits/stdc++.h>

using namespace std;

const int M_SIZE = 5e5+1;

char n_bit_letter[9];

int n;

string s;

char res[M_SIZE];

int main() {

    for(int i=1; i<=26; i++){
        n_bit_letter[ __builtin_popcountll(i+96)] = char(96+i);
    }

    cin>>n;

    cin>>s;

    int sum = 0;
    for(int i=0; i<s.size();i++){
        if(s[i] == '1')
            sum++;
    }

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

    for(int i=n; i>=1; i--){
        if(sum >= 3 * i + 3){
            res[i-1] = n_bit_letter[6];
            sum -= 6;
        } else{
            int nr = 3 + sum - 3 * i;
            res[i-1] = n_bit_letter[nr];
            sum -= nr;
        }
    }

    for(size_t i=0; i<n; i++)
        cout<<res[i];

    return 0;
}