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

typedef long long LL;
typedef long double LD;
typedef pair<int, int> PII;
typedef pair<LL, LL> PLL;

#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()

template<typename _T> inline void _DBG(const char *s, _T x) { cerr << s << " = " << x << "\n"; }
template<typename _T, typename... args> void _DBG(const char *s, _T x, args... a) { while(*s != ',') cerr << *s++; cerr << " = " << x << ','; _DBG(s + 1, a...); }

#ifdef LOCAL
#define _upgrade ios_base::sync_with_stdio(0);
#define DBG(...) _DBG(#__VA_ARGS__, __VA_ARGS__)
#else
#define _upgrade ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define DBG(...) (__VA_ARGS__)
#define cerr if(0) cout
#endif

// ********************** CODE ********************** //

const int N = 8e5 + 7;

const char characters[] = {'a', 'c', 'm', 'o'};

int n;
char s[N];

int main()
{
    _upgrade
    
    cin >> n >> s;

    int cnt_1 = 0;
    for (int i = 0; i < 8 * n; i++)
        if (s[i] == '1')
            cnt_1++;

    if (3 * n > cnt_1 || cnt_1 > 6 * n)
    {
        cout << "NIE\n";
        return 0;
    }

    cnt_1 -= 3 * n;
    for (int i = 0; i < n; i++)
    {
        int k = min(3, cnt_1);
        cnt_1 -= k;
        cout << characters[k];
    }
    cout << "\n";
    return 0;
}