/******************************************************************************

                            Online C Compiler.
                Code, Compile, Run and Debug C program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

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

int
main ()
{
  int cnt = 0;
  char *cols[43];
  size_t n = 0;
  FILE *fp = fopen ("input.txt", "r");
  FILE *fp2= fopen ("output.txt", "a");
  if (fp == NULL )
    {
      perror ("Unable to open file!");
      exit (1);
    }
  char *line2 = NULL;
  size_t len = 0;
clock_t begin = clock();

/* here, do your time-consuming job */

  while (getline (&line2, &len, fp) != -1)
    {
      n = 0;
      if (len > 43)
	for (char *p = strtok (line2, ";"); p; p = strtok (NULL, ";"))
	  {
	    if (n < 4)
	      fprintf (fp2,"%s;", p);
	    else if (n > 3 && n < 42)
	      {
		for (int x = n - 1; x > 2; x--)
		  {
		    if (strcmp (cols[x], p) == 0)
		      break;
		    else if (x < 4)
		      fprintf (fp2,"%s", p);
		  }
		fprintf (fp2,";");
	      }
	    cols[n++] = p;
	    if (n > 42)
	      break;
	  }
      fprintf (fp2,"\n");
    }
    
clock_t end = clock();
double time_spent = (double)(end - begin) / CLOCKS_PER_SEC;
printf ("%f\n",time_spent);
  return 0;
}