#include <iostream>
#include <iterator>
#include <algorithm>
#include <string>
using namespace std;
int main()
{
std::copy_if(
std::istream_iterator<std::string>(std::cin),
std::istream_iterator<std::string>(),
std::ostream_iterator<std::string>(std::cout, "\n"),
[](const std::string &s) { return !(s.size() & 1); }
);
return 0;
}
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