# Find an element

Very easy

Execution time limit is 3 seconds

Runtime memory usage limit is 128 megabytes

Array of n integers is given. Find its k-th element in decreasing order.

## Input

First line contains the number of elements n (1 ≤ n ≤ `10^5`

) in array, and integer k(1 ≤ k ≤ `10^5`

). Second line contains n integers, not greater than `10^9`

by absolute value.

## Output

Print the k-th element of array sorted in decreasing order, or -1 if such element does not exist.

## Examples

Input #1

Answer #1

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