Given an integer \(N\) which has \(D\) digits. You have to delete exactly \(K\) digits in integer \(N\).

Find out the largest possible number which can be built from \(N\) after removing exactly \(K\) digits.

Input Format:

• First line contains two space separated integers \(N\) \(K\).

Output Format:

Print the largest possible number which can be built from \(N\) after removing exactly \(K\) digits.

Constraints:

\(1 \le N \le 10^{18} \\ 1 \le K \le 3 \\ K \le D\)