Noble Integer

Given an integer array A, find if an integer p exists in the array such that the number of integers greater than p in the array equals to p.

First and only argument is an integer array A.

Return 1 if any such integer p is found else return -1.

Input 1:

 A = [3, 2, 1, 3]

Input 2:

 A = [1, 1, 3, 3]

Output 1:

 1

Output 2:

 -1

Explanation 1:

 For integer 2, there are 2 greater elements in the array. So, return 1.

Explanation 2:

 There is no such integer exists.