#include <algorithm>
#include <iostream>
#include <iterator>
#include <string>
using namespace std;
int main() {
vector<string> words;
copy(istream_iterator<string>{cin}, istream_iterator<string>{}, back_inserter(words));
copy(begin(words), end(words), ostream_iterator<string>{cout, ", "});
cout << endl;
}
I2luY2x1ZGUgPGFsZ29yaXRobT4KI2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8aXRlcmF0b3I+CiNpbmNsdWRlIDxzdHJpbmc+Cgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7Cgl2ZWN0b3I8c3RyaW5nPiB3b3JkczsKCWNvcHkoaXN0cmVhbV9pdGVyYXRvcjxzdHJpbmc+e2Npbn0sIGlzdHJlYW1faXRlcmF0b3I8c3RyaW5nPnt9LCBiYWNrX2luc2VydGVyKHdvcmRzKSk7Cgljb3B5KGJlZ2luKHdvcmRzKSwgZW5kKHdvcmRzKSwgb3N0cmVhbV9pdGVyYXRvcjxzdHJpbmc+e2NvdXQsICIsICJ9KTsKCWNvdXQgPDwgZW5kbDsKfQo=
these, are, some, words, and, some, more, words, apple, orange, pear, string, this, is, a, sentence,