#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;
}