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#include <iostream>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <string>
#include <bitset>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <algorithm>
#include <sstream>
#include <stack>
#include <iomanip>
#include <assert.h>
using namespace std;
#define pb push_back
#define mp make_pair
typedef pair<int,int> pii;
typedef long long ll;
typedef double ld;
typedef vector<int> vi;
#define fi first
#define se second
#define fe first
#define FO(x) {freopen(#x".in","r",stdin);freopen(#x".out","w",stdout);}
#define Edg int M=0,fst[SZ],vb[SZ],nxt[SZ];void ad_de(int a,int b){++M;nxt[M]=fst[a];fst[a]=M;vb[M]=b;}void adde(int a,int b){ad_de(a,b);ad_de(b,a);}
#define Edgc int M=0,fst[SZ],vb[SZ],nxt[SZ],vc[SZ];void ad_de(int a,int b,int c){++M;nxt[M]=fst[a];fst[a]=M;vb[M]=b;vc[M]=c;}void adde(int a,int b,int c){ad_de(a,b,c);ad_de(b,a,c);}
#define es(x,e) (int e=fst[x];e;e=nxt[e])
#define esb(x,e,b) (int e=fst[x],b=vb[e];e;e=nxt[e],b=vb[e])
char g[]={"acgo"};
int n;
char s[888888];
int main()
{
	for(int i=0;i<4;++i)
		assert(__builtin_popcount(g[i])==3+i);
	scanf("%d%s",&n,s);
	int c1=0;
	for(int i=0;i<8*n;++i) c1+=s[i]=='1';
	if(c1<3*n||c1>6*n) {
		puts("NIE");
		return 0;
	}
	string o;
	while(c1>5*n) c1-=6,n--,o.pb(g[3]);
	while(c1>4*n) c1-=5,n--,o.pb(g[2]);
	while(c1>3*n) c1-=4,n--,o.pb(g[1]);
	while(c1>2*n) c1-=3,n--,o.pb(g[0]);
	assert(c1==0&&n==0);
	puts(o.c_str());
}