#include <stdio.h>
#define MAXILINE 1000

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

int getline(void);
void  copy(void);
main()
{
int len;
extern int max;
extern char longest[];

max=0;
while ((len = getline()) > 0)
if(len>max){
max=len;
copy();
}
if(max>0)
printf("%s",longest);
return 0;
}
int getline(void)
{
int c,i;
extern char line[];

for(i=0;i<MAXILINE-1
&&(c=getchar())!=EOF && c!='\n';++i)
line[i]=c;
if(c=='\n'&& c=='\t'){
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;
}