#include <stdio.h>

#define MAXLINE 1000

int max;
char line[MAXLINE];
char longest[MAXLINE];

int getliner(void);
void copy(void);

main()
{
    int len;
    extern int max;
    extern char longest;

    max = 0;
    while ((len = getliner()) > 0)
    {
        if(len > max)
        {
            max = len;
            copy();
        }
    }
    if (max > 0)
        printf("%s", longest);
    return 0;
}

int getliner(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;
}

void copy(void)
{
    int i;
    extern char line[], longest[];

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