1 #include <iostream>
   2 #include <string>
   3 
   4 int main()
   5 {
   6     std::string line;
   7     bool linestart(true);
   8 
   9     while (std::getline(std::cin, line)) {
  10         if (line.empty()) {
  11             std::cout << std::endl;
  12             linestart = true;
  13         } else {
  14             if (!linestart) std::cout << '\t';
  15             std::cout << line;
  16             linestart = false;
  17         }
  18     }
  19     if (!linestart) std::cout << std::endl;
  20 }