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#include <cstdio>

char ans[] = "biko";
char input[800008];
int count;

int main()
{
	int n; 
	scanf("%d", &n);
	scanf("%s", input);
	for (int i = 0; i < 8 * n; ++i) if (input[i] == '1') count++;

	if (count < 3 * n || 6 * n < count) printf("NIE\n");
	else
	{
		int min_bit = count / n;
		int excess_bit = count % n;
		for (int i = 0; i < n - excess_bit; ++i) printf("%c", ans[min_bit - 3]);
		for (int i = 0; i < excess_bit; ++i) printf("%c", ans[min_bit - 2]);
		printf("\n");
	}

	return 0;
}