// No.597 concat
package main

import (
	"fmt"
	"strings"
)

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

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

	var sb strings.Builder
	for _, r := range s {
		sb.WriteString(string(r))
	}
	fmt.Println(sb.String())
}