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

FILE * f_open (char *name) {
	FILE * f;
	f = fopen (name, "r");
	if (f == NULL) {
		printf ("Файл не открылся\n");
		exit (1);
	}
	return f;
}

int main (void) {
	FILE *in;
	FILE *out;
	char name[128];
	unsigned char c, d = 'a';
	int n = 0, flag = 0;
	printf ("Введите имя файла\n");
	scanf ("%s", name);
	in = f_open (name);
	out = fopen ("out.txt", "w");
	if (out == NULL) {
		printf ("Файл не создан\n");
		return 0;
	}
	while (fscanf (in, "%c", &c) != EOF) {
		if (n == 254) {
			fprintf (out, "%c%c", (unsigned char) (n + 1), d);
			n = -1;
		}
		if ((c == d) && (flag != 0)) {
			n++;
		} else {
			if (flag == 0) {
				flag++;
				d = c;
			} else {
				fprintf (out, "%c%c", (unsigned char) (n + 1), d);
				d = c;
				n = 0;
			}
		}
	}
	fprintf (out, "%c%c", (unsigned char) (n + 1), d);
	fclose (in);
	fclose (out);
	return 0;
}