#include <iostream>

#include <string>

#include <vector>

#include <algorithm>

bool Palindrome(const std::string& str)

{

std::string temp = str;

std::reverse(temp.begin(), temp.end());

return str == temp;

}

void Print(const std::vector<std::string>& vec)

{

for (const auto &val : vec)

{

 std::cout << val << " ";

}

}

int main()

{

std::vector<std::string> palindromes;

std::string str;

std::cin >> str;

while (str != ".")

{

 if (Palindrome(str))

 {

  palindromes.push_back(str);

 }

 std::cin >> str;

}

Print(palindromes);

return 0;

}