#include <iostream>
#include <fstream>
#include <cstdlib>

using namespace std;

int main(int argc, char** argv) {

   if (argc < 3)
      return(EXIT_FAILURE);

   ifstream in(argv[1]);
   ofstream out(argv[2]);

   if (!in || !out)
     return(EXIT_FAILURE);

   char c;
   while (in.get(c)) {
      if (c == '\t')
         out << "   "; // 3 spaces
      else
         out << c;
   }
   
   out.close( );

   if (out)
      return(EXIT_SUCCESS);
   else
      return(EXIT_FAILURE);
}