#include <stdio.h>
#define MAXLINE 1000

int getline(char line[], int maxline);
void copy(char to[], char from[]);
/*output long string*/

main()
{
	int len;
	int max; 
	char line[MAXLINE];
	char longest[MAXLINE];
	char str;
	
	max = 0;
	while((len = getline(line, MAXLINE)) > 0) {
		if (len > max) {
		max = len;
		copy(longest, line);
		}
	}
	if (max > 0) {
		printf("%s", longest);
	}
	return 0;	
}

int getline(char s[], int lim)
{
	int c, i;
	
	for (i=0; i<lim-1 && (c=getchar()) != EOF && c!='\n'; ++i) {
		s[i] = c;
	}
	if (c == '\n') {
		s[i] = c;
		++i;
	}
	s[i] = '\0';
	return i;
}

void copy(char to[], char from[])
{
	int i;
	
	i = 0;
	while ((to[i] = from[i]) != '\0')
		++i;
}