#include <stdio.h>
#include <stdlib.h>

#define limit_radku 100

int ctiradek(char radek[], int);
void kopiruj(char radek[], char nejdeslsi[]);

int main()
{
   char radek[limit_radku];
   char nejdelsi[limit_radku];
   int max, tmp;
   max = 0;

   while ((tmp = ctiradek(radek, limit_radku)) > 0)
   {
      if (tmp > max)
      {
         max = tmp;
         kopiruj(radek, nejdelsi);
      }
   }

   printf("\n");
   int c;
   for (int i = 0; (c = nejdelsi[i]) != '\0'; i++)
      printf("%c", c);
   printf("\n");
}

int ctiradek(char r[], int limit)
{
   int i, c;
   for (i = 0;i < limit && (c = getchar()) != EOF && c != '\n';i++)
      r[i] = c;
   if (c == '\n')
   {
      r[i] = c;
      i++;
   }
   r[i] = '\0';
   return i;
}

void kopiruj(char zdroj[], char cil[])
{
   int i = 0;
   while ((cil[i] = zdroj[i]) != '\0')
   i++;
}