Project described here:
https://preciselab.io/last-occurrence/
You have been given an array of size N consisting of integers. In addition you have been given an element M you need to find and print the index of the last occurrence of this element M in the array if it exists in it, otherwise print -1. Consider this array to be 1 indexed.
Input Format:
The first line consists of 2 integers N and M denoting the size of the array and the element to be searched for in the array respectively . The next line contains N space separated integers denoting the elements of of the array.
Output Format
Print a single integer denoting the index of the last occurrence of integer M in the array if it exists, otherwise print -1.
Constraints
1 < N < 10^5
1 < A[i] < 10^9
1 < M < 10^9
SAMPLE INPUT
5 1
1 2 3 4 1
SAMPLE OUTPUT
5