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#include <bits/stdc++.h>
using namespace std;
#define PII pair<int, int>
#define VI vector<int>
#define VPII vector<PII>
#define LL long long
#define LD long double
#define f first
#define s second
#define MP make_pair
#define PB push_back
#define endl '\n'
#define ALL(c) (c).begin(), (c).end()
#define SIZ(c) (int)(c).size()
#define REP(i, n) for(int i = 0; i < (int)(n); ++i)
#define FOR(i, b, e) for(int i = (b); i <= (int)(e); ++i)
#define FORD(i, b, e) for(int i = (b); i >= (int)(e); --i)
 
#define sim template<class n
sim, class s> ostream & operator << (ostream &p, pair<n, s> x)
{return p << "<" << x.f << ", " << x.s << ">";}
sim> auto operator << (ostream &p, n y) ->
typename enable_if<!is_same<n, string>::value, decltype(y.begin(), p)>::type 
{int o = 0; p << "{"; for(auto c: y) {if(o++) p << ", "; p << c;} return p << "}";}
void dor() {cerr << endl;}
sim, class...s> void dor(n p, s...y) {cerr << p << " "; dor(y...);}
sim, class s> void mini(n &p, s y) {if(p>y) p = y;}
sim, class s> void maxi(n &p, s y) {if(p<y) p = y;}
// #ifdef DEB
#define debug(...) dor(__FUNCTION__, ":", __LINE__, ": ", __VA_ARGS__)
// #else
// #define debug(...)
// #endif 
 
#define I(x) #x " =", (x), " "
#define A(a, i) #a "[" #i " =", i, "] =", a[i], " "

using namespace std;

const int MXN = 1e6+5;
char in[MXN];
char have[10];

int main()
    {
    FOR(i, 'a', 'z')
        {
        int cnt = __builtin_popcount(i);
        if(have[cnt] == 0)
            {
            have[cnt] = i;
            }
        }

    int n;
    scanf("%d %s", &n, in);
    
    int cnt = 0;
    REP(i, 8 * n)
        {
        cnt += in[i] == '1';
        }
    cnt -= 3 * n;
    if(cnt < 0 || cnt > 3 * n)
        {
        cout << "NIE" << endl;
        return 0;
        }
    REP(i, n)
        {
        int now = min(cnt, 3);
        cout << have[now + 3];
        cnt -= now;
        }
    cout << endl;
    }