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Score : $200$ points

### Problem Statement

You are given integers $L$, $R$, and a string $S$ consisting of lowercase English letters.
Print this string after reversing (the order of) the $L$-th through $R$-th characters.

### Constraints

• $S$ consists of lowercase English letters.
• $1 \le |S| \le 10^5$ ($|S|$ is the length of $S$.)
• $L$ and $R$ are integers.
• $1 \le L \le R \le |S|$

### Input

Input is given from Standard Input in the following format:

$L$ $R$
$S$


### Output

Print the specified string.

### Sample Input 1

3 7
abcdefgh


### Sample Output 1

abgfedch


After reversing the $3$-rd through $7$-th characters of abcdefgh, we have abgfedch.

### Sample Input 2

1 7
reviver


### Sample Output 2

reviver


The operation may result in the same string as the original.

### Sample Input 3

4 13
merrychristmas


### Sample Output 3

meramtsirhcyrs