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#include <algorithm>
#include <cstdio>
using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define INT(x) int x; scanf("%d", &x)

const char C[5] = "acgo";

int main() {
	INT(n);
	scanf("\n");
	int ones = 0, n8 = n << 3;
	REP(i,n8) ones += getchar() == '1';
	if (ones < 3 * n || ones > 6 * n) {
		printf("NIE\n");
		return 0;
	}
	ones -= 3 * n;
	REP(i,n) {
		int x = min(ones, 3);
		putchar(C[x]);
		ones -= x;
	}
	putchar('\n');
}