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:

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