// g++ -Wall -Wextra -O2 -s -o DeleteBlankLines DeleteBlankLines.cc -ldstr
#include <Dstr>
int main (int argc, char **argv) {
  Dstr buf;
  while (!buf.getline(stdin).isNull()) {
    buf.trim_tail();
    if (buf.length())
      printf ("%s\n", buf.aschar());
  }
  return 0;
}