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

#define DEFAULT_LINE_LENGTH 80


main (int argc, char* argv[], char* env[])
{
   int line_length = -1;
   int c, n = 0;
   char* columns;
   
   if (argc > 1)
      line_length = atoi(argv[1]);
   if (line_length < 1 && (columns = getenv("COLUMNS")))
      line_length = atoi(columns);
   if (line_length < 1)
      line_length = DEFAULT_LINE_LENGTH;

   while ((c = getchar()) != EOF)
   {
      if (c == '\n') continue;

      if (++n > line_length - 1) 
      {
	 putchar('\n');
	 n = 0;
      }

      putchar(c);
   }

   return 0;
}