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#include "stdio.h"
#include <string>
#include <array>
#include <queue>
#include <set>
#include <utility>


int main() {
	int n;
	scanf("%d ", &n);
	int count = 0;
	for (int i = 0; i < 8 * n; ++i) {
		char c;
		scanf("%c", &c);
		count += c - '0';
	}

	if (count < 3 * n || count > 6 * n) {
		printf("NIE\n");	
		return 0;
	}

	count -= 3 * n;
	for (int i = 0; i < n; ++i) {
		if (count >= 3) {
			printf("o");
			count -= 3;
		} else if (count >= 2) {
			printf("g");
			count -= 2;
		} else if (count >= 1) {
			printf("c");
			count -= 1;
		} else {
			printf("a");
		}
	}
	printf("\n");


	return 0;
}