Problem:
Score : 400 points

Problem Statement

Takahashi has a string S consisting of lowercase English letters.

Starting with this string, he will produce a new one in the procedure given as follows.

The procedure consists of Q operations. In Operation i (1 \leq i \leq Q), an integer T_i is provided, which means the following:

If T_i = 1: reverse the string S.

If T_i = 2: An integer F_i and a lowercase English letter C_i are additionally provided.

If F_i = 1 : Add C_i to the beginning of the string S.

If F_i = 2 : Add C_i to the end of the string S.

Help Takahashi by finding the final string that results from the procedure.

Constraints

1 \leq |S| \leq 10^5

S consists of lowercase English letters.

1 \leq Q \leq 2 \times 10^5

T_i = 1 or 2.

F_i = 1 or 2, if provided.

C_i is a lowercase English letter, if provided.

Input

Input is given from Standard Input in the following format:

S
Q
Query_1
:
Query_Q

In the 3-rd through the (Q+2)-th lines, Query_i is one of the following:

1

which means T_i = 1, and:

2 F_i C_i

which means T_i = 2.

Output

Print the resulting string.

Sample Input 1

a
4
2 1 p
1
2 2 c
1

Sample Output 1

cpa

There will be Q = 4 operations. Initially, S is a.

Operation 1: Add p at the beginning of S. S becomes pa.

Operation 2: Reverse S. S becomes ap.

Operation 3: Add c at the end of S. S becomes apc.

Operation 4: Reverse S. S becomes cpa.

Thus, the resulting string is cpa.

Sample Input 2

a
6
2 2 a
2 1 b
1
2 2 c
1
1

Sample Output 2

aabc

There will be Q = 6 operations. Initially, S is a.

Operation 1: S becomes aa.

Operation 2: S becomes baa.

Operation 3: S becomes aab.

Operation 4: S becomes aabc.

Operation 5: S becomes cbaa.

Operation 6: S becomes aabc.

Thus, the resulting string is aabc.

Sample Input 3

y
1
2 1 x

Sample Output 3

xy

Solution in Go (1.6) (judge verdict: Accepted)

package main

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

const (
	initialBufSize = 64 * 1024
	maxBufSize     = 10000000
)

var (
	scanner = bufio.NewScanner(os.Stdin)
	writer  = bufio.NewWriter(os.Stdout)
)

func main() {
	scanner.Buffer(make([]byte, maxBufSize), maxBufSize)
	scanner.Split(bufio.ScanWords)
	s := scanText()
	q := scanInt()

	isReverse := false
	head, tail := "", ""
	for i := 0; i < q; i++ {

		if scanInt() == 1 {
			isReverse = !isReverse
			continue
		}

		if f := scanInt(); (f == 1 && !isReverse) || (f == 2 && isReverse) {
			head += scanText()
		} else {
			tail += scanText()
		}
	}

	ans := reverse(head) + s + tail

	if isReverse {
		fmt.Print(reverse(ans))
	} else {
		fmt.Print(ans)
	}
}

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

func scanInt() int {
	i, _ := strconv.Atoi(scanText())
	return i
}

func scanInts(size int) []int {
	ints := make([]int, size)
	for i := 0; i < size; i++ {
		ints[i] = scanInt()
	}
	return ints
}

func scanText() string {
	scanner.Scan()
	return scanner.Text()
}

func abs(n int) int {
	return int(math.Abs(float64(n)))
}

func pow(x, y int) int {
	return int(math.Pow(float64(x), float64(y)))
}