#include <stdio.h>
#define MAXLINE 1000

int max_len;
char current_line[MAXLINE];
char longest[MAXLINE];

int getlime();
void copy();

int main() {
  int current_len;
  extern int max_len;
  extern char longest[];

  max_len = 0;
  while ((current_len = getlime()) > 0)
    if (current_len > max_len) {
      max_len = current_len;
      copy();
    }
  if (max_len > 0) /* there was some line */
    printf("%s", longest);

  return 0;
}

int getlime() {
  int ch, i;
  extern char current_line[];

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

void copy() {
  extern char current_line[], longest[];

  for (int i = 0; (longest[i] = current_line[i]) != '\0'; ++i)
    ;
}