import java.util.LinkedHashMap;
import java.util.Scanner;
import java.util.ArrayList;
import java.util.Arrays;
class Hello {
  public static void main(String[] args) {
    Scanner scanner = new Scanner (System.in);
    String [] line =Arrays.stream(scanner.nextLine().split(" ")).filter(l -> l.lenght()%2 ==0).toArray(String[]::new);

    for (String l:line){
      System.out.println(l);
    }



  }
}