#include <iostream>
#include <fstream>
#include <stdlib.h>

int main() {
	  char ch;
	  std::ifstream in;
      std::ofstream out;
	  in.open("a.txt");
	  out.open("b.txt");
	  if (!in.good()) {
          std::cout << "File doesn't exist" << std::endl;
	     return 0;
	  }
	  while (!in.eof()) {
	    ch = in.get();
	    if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u')
	     ch = '*';
	    out.put(ch);
	  }
	  in.close();
	  out.close();
	  return 0;
}