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#include <bits/stdc++.h>

using namespace std;

constexpr int nax = 1e5 + 5;

char res[nax];

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

    int n;
    cin >> n;
    int ctr = 0;
    for (int i = 0; i < 8 * n; ++i) {
        char c;
        cin >> c;
        ctr += c == '1';
    }

    for (int bit : {6, 5, 0, 1, 2, 3}) {
        for (int i = 0; i < n; ++i) {
            if (ctr) {
                res[i] ^= 1 << bit;
                ctr--;
            }
        }
    }

    if (ctr) {
        cout << "NIE\n";
        return 0;
    }

    string ans;
    for (int i = 0; i < n; ++i) {
        if (res[i] >= 'a' and res[i] <= 'z') {
            ans += res[i]; 
        } else {
            cout << "NIE\n";
            return 0;
        }
    }

    cout << ans << "\n";
}