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

int main(argc,argv)
int argc;
char **argv;
{
 if(argc < 2)
 {puts("Usage: tocom source [out]");
  exit(1);}
 FILE *out,*in;
 in=fopen(argv[1],"r");
 if(argc > 2)
 {out=fopen(argv[2],"w");}
 else out=stdout;
 char mod;
 char b;
 char c;
 do
 {c=fgetc(in);
  if(c>='0' && c<='9')
  {c=c-'0';
   if(mod==2) c=b*16+c;}
  else if(c>='A' && c<='F')
  {c=c-'A'+10;
   if(mod==2) c=b*16+c;}
  else if(c>='a' && c<='f')
  {c=c-'a'+10;
   if(mod==2) c=b*16+c;}
  else if(c==';')
   {do
    {c=fgetc(in);} while(c!=10 && c!=EOF);
    continue;}
  else continue;
  if(mod==2)
  {fputc(c,out);
   mod=1;}
  else
  {b=c;
   mod=2;}} while(c!=EOF);
 fclose(in);
 fclose(out);
}