454. Non-Allergic String

0

Medium

Bob is allergic to strings that contain adjacent characters of the same type, with a total of k duplicates.

You are given a string s and an integer k. A k duplicate removal involves selecting k adjacent and identical letters from s and removing them, resulting in the concatenation of the remaining characters on both sides of the deleted substring. Repeat the process of k duplicate removals on s until it is no longer possible.

Print the final Non - Allergic String.

Input Format

The first line contains a single integer k.
The second line contains a string s

Output Format

Print a Non- Allergic string

Example

Input

2 CooodddingBlllllocks

Output

CodingBlocks

Constraints

1 <= <= 104
1 <= k <= N
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