import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.Scanner;


public class Lab1 {

     public static void main(String[] args) throws FileNotFoundException {

         int n = 0;
         String line = "";
         String result = "";

         // scan file
         Scanner scanner = new Scanner(System.in);

         // save the number
         n = scanner.nextInt();

         // check if n is between 2 and 10000
         if (n>=2 && n<=10000) {

             // loop n times
             for (int i=1; i<=n; i++) {

                 // scan next line
                 line = scanner.next();

                 // remove white space
                 line = line.replaceAll("\\s+","");

                 // match if line contains a-z
                 if (line.matches("^[a-z]+$")) {

                     result += line;
                 }

             }
            // print line
             System.out.print(result);

         }

         scanner.close();
    }
}