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#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,n) for (int i=a;i<n;i++)
#define per(i,a,n) for (int i=n-1;i>=a;i--)
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define SZ(x) ((int)(x).size())
typedef vector<int> VI;
typedef long long ll;
typedef pair<int,int> PII;
typedef double db;
const ll mod=1000000007;

mt19937 mrand(chrono::high_resolution_clock::now().time_since_epoch().count());
int rnd(int x) { return mrand() % x;}

ll powmod(ll a,ll b) {ll res=1;a%=mod; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}
ll gcd(ll a,ll b) { return b?gcd(b,a%b):a;}
// head

const int N=801000;

int n;
char s[N];
int cnt[N];
int main() {
	scanf("%d",&n);
	scanf("%s",s);
	int c1=0;
	rep(i,0,8*n) c1+=s[i]=='1';
	rep(i,0,c1) cnt[i%n]++;
	rep(i,0,n) if (cnt[i]<=2||cnt[i]>=7) {
		puts("NIE");
		return 0;
	}
	rep(i,0,n) putchar("acgo"[cnt[i]-3]);
	puts("");
}