#include <iostream>
#include <vector>
#include <string>
#include <sstream>
#include <iterator>

int main() {

    std::vector<std::string> v;
    v.push_back("a");
    v.push_back("b");
    v.push_back("c");
    
    std::stringstream os;
    os << '(';
    std::copy(v.begin(), v.end(), std::ostream_iterator<std::string>(os, ", "));
    os.seekp(-2, std::ios_base::cur);
    os << ')';

    std::cout << os.str() << ".";
    
	return 0;
}