//Written by Tanya Khovanova and Sergei Bernstein

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * PalindromeFinder takes lines of text on standard input and prints 
 * each line which is a strict palindrome to standard output.
 * A string is a strict palindrome if its reverse is equal to itself.
*/
public class PalindromeFinder {
  public static void main(String[] args) throws IOException {
    BufferedReader reader = new BufferedReader( new InputStreamReader(System.in));
    for(String dictWord = reader.readLine(); dictWord != null; dictWord = reader.readLine()) {
      if (isPalindrome(dictWord))
	System.out.println(dictWord);
    }
  }

  public static boolean isPalindrome(String word) {
    StringBuffer bufferOfWord = new StringBuffer(word);
    String wordBackwards = (bufferOfWord.reverse()).toString();
    return (word.equals(wordBackwards));
  }
}