Breaking the leaderboard
Hacker Vasya is frustrated that Kolya holds the top spot on the leaderboard of Petryk's game. Using a clever trick, Vasya managed to manipulate the scoreboard to display a number next to his name, determined by the game's machine code. To make this number appear more believable, he wants to remove a certain number of digits from it, ensuring that the remaining number is as large as possible.
Your task is to help Vasya determine the largest possible number he can achieve after removing the specified digits.
Input
The first line contains two integers N and k (0 ≤ k < N ≤ 300000), representing the total number of digits in the original number and the number of digits to be removed, respectively. The second line contains the original natural number, composed of N digits.
Output
Print the largest number Vasya can obtain on a single line.