题目描述
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.
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.
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.
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
输入格式
见题面 Input 部分
输出格式
见题面 Output 部分