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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)


import java.util.Scanner;

public class Main {
	
	public static void main(String[] args) {
		
		Scanner in = new Scanner(System.in);
		int count = 0;
		boolean flag = false;
		StringBuilder s = new StringBuilder(in.nextLine());
		StringBuilder front = new StringBuilder("");
		StringBuilder back = new StringBuilder("");
		int q = in.nextInt();
		for(int i=0; i<q; i++) {
			int op = in.nextInt();
			if(op==1) {
				count++;
				flag = !flag;
			}else if(op==2) {
				int position = in.nextInt();
				char c = in.next().charAt(0);
				if(flag) {
					if(position==1) position=2;
					else if(position==2) position=1;
				}
				if(position==1) {
					front.append(c);
				}else if(position==2) {
					back.append(c);
				}
			}
		}
		if(count%2!=0) {
			System.out.print(back.reverse().append(s.reverse()).append(front));
		}else {
		    System.out.print(front.reverse().append(s).append(back));
		}
	}
	
}