package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

var sc = bufio.NewScanner(os.Stdin)

func Scanner() string {
	sc.Scan()
	return sc.Text()
}
func main() {
	buf := make([]byte, 0)
	sc.Buffer(buf, 100000007)
	sc.Split(bufio.ScanWords)
	n, _ := strconv.Atoi(Scanner())
	t := make([]int, n)
	s := make([]string, n)
	s1 := make([]rune, 300000)
	s2 := make([]rune, 200000)
	len, len2 := n, 0
	for i := 0; i < n; i++ {
		t[i], _ = strconv.Atoi(Scanner())
		s[i] = Scanner()
		if t[i] == 0 {
			s1[len] = []rune(s[i])[0]
			len++
		} else {
			s2[len2] = []rune(s[i])[0]
			len2++
		}
	}
	s1 = s1[:len]
	s2 = s2[:len2]
	fmt.Printf("%s\n", string(append(reverse(s2), s1...)))
}

func reverse(s []rune) []rune {
	for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
		s[i], s[j] = s[j], s[i]
	}
	return s
}