#include <stdio.h>
#include <stdlib.h>
#include <explode.c>

int main(int argc, char *argv[]) {
	if(argc != 1+2) {
		fprintf(stderr, "usage: %s linesperavg delim\n", argv[0]);
		return 1;
	}
	char *delim = argv[2];
	int linesperavg = atoi(argv[1]);
	char **list;
	size_t i, len;
	char line[1337];
	int iter = 0;
	double *values;
	fgets(line, 1337, stdin);
	line[strcspn(line, "\n")] = 0;

	while(1) {

		explode(line, delim, &list, &len);

		if(iter == 0) {
			values = malloc(sizeof(double) * len);
		}

		for(i = 0; i < len; ++i) {
			values[i] = ( values[i] * (iter% linesperavg) + atof(list[i]) ) / ((iter% linesperavg)+1);
			// fprintf(stderr, "d: ( %f * (%d%% %d) + %f ) / ((%d%% %d)+1)\n", values[i], iter,
			// 	linesperavg, atof(list[i]), iter, linesperavg);
			// fprintf(stderr, "x: %f\n", values[i]);
		}

		if(iter% linesperavg == linesperavg-1) {
			for(int j = 0; j < len; j++) {
				if(j == len-1) {
					printf("%f", values[j]);
				} else {
					printf("%f%s", values[j], delim);
				}
			}
			printf("\n");
		}

		/* free list */
		for(i = 0; i < len; ++i) {
			free(list[i]);
		}

		free(list);

		fgets(line, 1337, stdin);

		if(feof(stdin)) {
			break;
		}
		// fprintf(stderr, "d: %s", line);
		line[strcspn(line, "\n")] = 0;

		iter++;
	}
	free(values);
	return 0;
}