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

char line[1001];
char nline[2001];

int main ()
{
	int i, j;
	char ch;
	line[0] = '1';
	line[1] = 0;
	while (1) {
		i = 0;
		j = 0;
		printf ("%s\n\n", line);
		while (line[i]) {
			ch = line[i];
			nline[j] = '0';
			while (line[i] == ch) {
				++nline[j];
				++i;
			}
			++j;
			nline[j] = ch;
			++j;
		}
		nline[j] = 0;
		if (strlen (nline) >= sizeof (line))
			break;
		strcpy (line, nline);
	}
	return 0;
}