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#include <bits/stdc++.h>

using namespace std;

#define endl '\n'
#define st first
#define nd second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define ll long long
ll mod=1000000007;
int inf=1000000007;
ll infl=1000000000000000007;

char rep[10];
int ans[100007];

int main()
{
    rep[3]='a';
    rep[4]='c';
    rep[5]='g';
    rep[6]='o';
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    string s;
    cin>>n>>s;
    int c=0;
    for(auto x:s) c+=(x=='1');
    if(c<3*n||c>6*n)
    {
        cout<<"NIE";
        return 0;
    }
    for(int i=1;i<=n;i++)
    {
        ans[i]=3;
        c-=3;
    }
    for(int i=1;i<=n;i++)
    {
        int x=min(3,c);
        ans[i]+=x;
        c-=x;
    }
    for(int i=1;i<=n;i++) cout<<rep[ans[i]];

    return 0;
}