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B - A Reverse

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.

3 7
abcdefgh

abgfedch

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

1 7
reviver

reviver

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

4 13
merrychristmas

meramtsirhcyrs