#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void rm(char *code, int n){
	char *buf;

	if(n == 0){
		printf("%s\n", code);
		return;
	}

	buf = malloc(strlen(code)+2);

	strcpy(buf, code);
	strcat(buf, ".");
	rm(buf, n-1);

	if(n >= 2){
		strcpy(buf, code);
		strcat(buf, "-");
		rm(buf, n-2);
	}

	free(buf);
}


int main(int argc, char *argv[]){
	int len;

	if(argc != 2){
		printf("usage: %s n\n", argv[0]);
		return 1;
	}

	len = atoi(argv[1]);

	if(len <= 0){
		printf("n must be integer >= 1\n");
		return 1;
	}

	rm("", len);

	return 0;
}