text: #include "read_words-4-5.h"
  
  #include <iostream>
  #include <string>
  #include <vector>
  
  using std::cin;
  using std::cout;
  using std::endl;
  
  using std::string;
  using std::vector;
  
  int main() {
  	vector<string> words;
  	read_words(cin, words);
  
  	cout << "Number of words: " << words.size() << endl;
  	return 0;
  }
  