#include <stdlib.h>

#include <string.h>

#include <stdio.h>

static int

compare (const void *a, const void *b)

{

  return strcmp (*(char **) a, *(char **) b);

}

int

main (void)

{

  char bufs[500][20];

  char *lines[500];

  size_t lens[500];

  size_t i, j;

  srandom (1);

  for (i = 0; i < 500; ++i)

    {

      lens[i] = random() % 19;

      lines[i] = bufs[i];

      for (j = 0; j < lens[i]; ++j)

	lines[i][j] = random() % 26 + 'a';

      lines[i][j] = '\0';

    }

  qsort (lines, 500, sizeof (char *), compare);

  for (i = 0; i < 500 && lines[i] != NULL; ++i)

    puts (lines[i]);

  return 0;

}