#include <iostream>
#include <sstream>
#include <boost/archive/iterators/binary_from_base64.hpp>
#include <boost/archive/iterators/transform_width.hpp>
 
std::string base64_decode(const std::string &s) {
  namespace bai = boost::archive::iterators;
 
  std::stringstream os;
 
  typedef bai::transform_width<bai::binary_from_base64<const char *>, 8, 6>
      base64_dec;
 
  unsigned int size = s.size();
 
  // Remove the padding characters, cf.
  // https://s...content-available-to-author-only...t.org/trac/boost/ticket/5629
  if(size && s[size - 1] == '=') {
    --size;
    if(size && s[size - 1] == '=') --size;
  }
  if(size == 0) return std::string();
 
  std::copy(base64_dec(s.data()), base64_dec(s.data() + size),
            std::ostream_iterator<char>(os));
 
  return os.str();
}
 
int main(int argc, char *argv[])
{
  std::string str;
  std::cin >> str;
  std::cout << base64_decode(str);
  return 0;
}
 

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