#include <stdio.h>

#define MAXLINE 1000 /* maximum input line size */

/* EXTERNAL VARIABLES */
int max; 		/* maximum length seen so far */
char line[MAXLINE]; 	/* current input line */
char longest[MAXLINE]; 	/* longest line saved here */


/* FUNCTION PROTOTYPES */
int getline(void);
void copy(void);


/* print longest input line; specialized version */
main()
{
	int len;
	extern int max;
	extern char longest[];

	max = 0;
	while ((len = getline()) > 0)
	   if (len > max) {
		max = len;
		copy();
	   }

	if (max > 0) /* there was a line */
	   printf("%s", longest);
	return 0;
}


/* getline: specialized version */
int getline(void)
{
	int c, i;
	extern char line[];


	for (i = 0; i < MAXLINE - 1 && (c=getchar( )) != EOF && c != '\n'; ++i)
	   line[i] = c;
	if (c == '\n') {
	   line[i] = c;
	   ++i;
	}
	line[i] = '\0';
	return i;
}


/* copy: specialized version */
void copy(void)
{
	int i;
	extern char line[], longest[];

	i = 0;
	while ((longest[i] = line[i]) != '\0')
	   ++i;
}



/*

 * "Definition" refers to the place where the variable is created or assigned storage.

 * "Declaration" refers to places where the nature of the variable is stated but no storage is allocated.

 * Avoid the use of external variables whenever you can.
 */