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#include <bits/stdc++.h>

using namespace std;

bool pos(int a, int b){
	//if(b<=0) return false;
	int mini = 3*b;
	int maxi = 6*b;
	if(a>=mini&&a<=maxi) return true;
	return false;
}

int main(){
	ios_base::sync_with_stdio(0);
	int n; cin>>n;
	int a = 0;
	for(int i = 0; i < n*8; i++){
		char c; cin>>c;
		if(c=='1') a++;
	}
	if(pos(a, n)){
		while(pos(a-6, n-1)){
			cout<<'o';
			a-=6; n-=1;
		}
		while(pos(a-5, n-1)){
			cout<<'n';
			a-=5; n-=1;
		}
		while(pos(a-4, n-1)){
			cout<<'c';
			a-=4; n-=1;
		}
		while(pos(a-3, n-1)){
			cout<<'a';
			a-=3; n-=1;
		}
		cout<<'\n';
	}else{
		cout<<"NIE\n";
	}
	return 0;
}