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

int main() {
    cin.tie(0);
    ios_base::sync_with_stdio(false);
    int n;
    int m;
    int s1, s2, s3, s4;
    string s;
    cin >> n;
    int j = 0, z = 0;
    cin >> s;
    for(int i = 0; i < s.size(); i++) {
        if (s[i] == '1') {
            j++;
        } else {
            z++;
        }
    }
    // cout << s.length() << " " << j + z << endl;
    // cout << j << " " << z << endl;
    j -= 2*n;
    z -= n;
    if (j >= 0 && z >= 0) {
        j -= n;
        z -= 4 * n;
        if (j >= 0 && z <= 0) {
            m = j;
            if (m <= 3 * n) {
                if (j+z == 0) {
                    s4 = m/3;
                    if (m % 3 == 1) {
                        s2 = 1;
                        s3 = 0;
                    } else if (m % 3 == 2) {
                        s2 = 0;
                        s3 = 1;
                    } else {
                        s2 = 0;
                        s3 = 0;
                    }
                    s1 = n-s4-s3-s2;
                    for (int i = 0; i < s1; i++) {
                        cout << 'a';
                    }
                    for (int i = 0; i < s2; i++) {
                        cout << 'c';
                    }
                    for (int i = 0; i < s3; i++) {
                        cout << 'g';
                    }
                    for (int i = 0; i < s4; i++) {
                        cout << 'o';
                    }
                    return 0;
                }    
            }
        } 
    }
    cout << "NIE";
    return 0;
}