code.cpp

#include <iostream>
#include <string>

std::string& normalize(std::string& s, const char c = '_') {
  auto j = s.begin();
  for (auto i = s.begin(); i != s.end(); ++i) {
    if (*i != c || (j != s.begin() && *(j - 1) != c))
      *j++ = std::move(*i);
  }
  s.erase(j, s.end());
  if (!s.empty() && s.back() == c)
    s.pop_back();
  return s;
}

int main() {
  std::string s;
  std::cin >> s;
  std::cout << normalize(s);
  return 0;
}