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#include<bits/stdc++.h>
#define VAR(i,n) __typeof(n) i = (n)
#define loop(i,j,s) for(int i=j;i<s;i++)
#define loopback(i,j,s) for(int i=j;i>=s;i--)
#define foreach(i,c) for(VAR(i,(c).begin());i!=(c).end();i++)
#define pln( x ) cout << x << "\n"
#define ps( x ) cout << x << " "
#define entr cout << "\n"
#define pcnt(i) __builtin_popcount(i)
#define ll long long
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define SIZE(c) (c).size()
#define ALL(c) (c).begin(), (c).end()
using namespace std;
typedef vector<int> VI;
typedef pair<int, int> PII;
typedef vector<vector<int> > VVI;
const int INFTY=20000000;
const int MAX=500100;
const int MOD=10000000;

void coutTab(int* tab,int n){
	loop(i,0,n){
		cout<<tab[i]<<" ";
	}
	cout<<"\n";
}

template<class T> void coutVec(vector<T> tab){
	for(T t : tab){
		cout<<t<<" ";
	}
	cout<<"\n";
}
//------------------------------------------
void print(char a, int c) {
    loop(i,0,c) cout<<a;
}

char get(int i) {
    switch(i) {
        case 3: return 'a';
        case 4: return 'c';
        case 5: return 'g';
        case 6: return 'o';
    }
}

int main(){
	ios_base::sync_with_stdio(0);
    int n;
    cin>>n;
    string a;
    cin>>a;
    int c = 0;
    loop(i,0,8*n) c += (a[i] == '1');
    if(c < 3*n || c > 6*n) {
        pln("NIE");
        return 0;
    }
    
    int e = c/n;
    int b = c%n;
    print(get(e+1), b);
    print(get(e), n-b);
    entr;
}