First element to occur k times
Basic Accuracy: 45.2% Submissions: 22622 Points: 1

Given an array of N integers. The task is to find the first element that occurs K number of times. If no element occurs K times the print -1.

Input:
The first line of input contains an integer T denoting the number of test cases. Then T test cases follow. The first line of each test case contains an integer N denoting the size of an array and the number K. The second line of each test case contains N space separated integers denoting elements of the array A[ ].

Output:
For each test case in a new line print the required answer.

Constraints:
1 <= T <= 100
1 <= N, K <= 105
1<= A <= 106

Example:
Input :
1
7 2
1 7 4 3 4 8 7
Output :
7

Explanation:
Both 7 and 4 occur 2 times. But 7 is the first that occurs 2 times.

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