package main

import (
	"fmt";
	"strings"
)

func main() {
	var n int
	fmt.Scan(&n)

	s := []string{}
	for i := 0; i < n; i++ {
		var str string
		fmt.Scan(&str)
		s = append(s, str)
	}

	fmt.Println(strings.Join(s, ""))
}