#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <strings.h>

extern const char *__progname;

typedef struct blk BLK;

struct blk {
  BLK *link;
  char data[65500];
  int fill;
  } ;

static BLK *head;
static BLK **tail;
static int length;

int main(void);
int main(void)
{
 BLK *b;
 int n;
 int w;
 int o;
 int l;

 tail = &head;
 length = 0;
 while <"input"> (1)
  { b = malloc(sizeof(BLK));
    *tail = b;
    tail = &b->link;
    o = 0;
    while (o < sizeof(b->data))
     { n = read(0,&b->data[o],sizeof(b->data)-o);
       if (n < 0)
	{ fprintf(stderr,"%s: input read error: %s\n",__progname,strerror(errno));
	  exit(1);
	}
       if (n == 0)
	{ b->fill = o;
	  break <"input">;
	}
       o += n;
       length += n;
     }
    b->fill = o;
  }
 *tail = 0;
 if (! head)
  { printf("0:");
    return(0);
  }
 n = 0;
 b = head;
 head = b->link;
 o = 0;
 while (1)
  { if (n < 1)
     { if (length < 1) break;
       n = length;
       if (n > 255) n = 255;
       length -= n;
       printf("%d:",n);
       fflush(stdout);
     }
    else if (o >= b->fill)
     { free(b);
       b = head;
       head = b->link;
       o = 0;
     }
    else
     { l = b->fill - o;
       if (l > n) l = n;
       w = write(1,&b->data[o],l);
       if (w < 0)
	{ fprintf(stderr,"%s: output write error: %s\n",__progname,strerror(errno));
	  exit(1);
	}
       o += w;
       n -= w;
     }
  }
 if (length) abort();
 printf("0:");
 return(0);
}