Problem: Ehab loves number theory, but for some reason he hates the number x. Given an array a, find the length of its longest subarray such that the sum of its elements isn't divisible by x, or determine that such subarray doesn't exist.

An array a is a subarray of an array b if a can be obtained from b by deletion of several (possibly, zero or all) elements from the beginning and several (possibly, zero or all) elements from the end.

Input

The first line contains an integer t (1 ≤ t ≤ 5) — the number of test cases you need to solve. The description of the test cases follows.

The first line of each test case contains 2 integers n and x (1 ≤ n ≤ 10^5, 1 ≤ x ≤ 10^4) — the number of elements in the array a and the number that Ehab hates.

The second line contains n space-separated integers a_1, a_2, …, a_{n} (0 ≤ a_i ≤ 10^4) — the elements of the array a.

Output

For each testcase, print the length of the longest subarray whose sum isn't divisible by x. If there's no such subarray, print -1.

Example

Input


3
3 3
1 2 3
3 4
1 2 3
2 2
0 6


Output


2
3
-1

Note

In the first test case, the subarray [2,3] has sum of elements 5, which isn't divisible by 3.

In the second test case, the sum of elements of the whole array is 6, which isn't divisible by 4.

In the third test case, all subarrays have an even sum, so the answer is -1.

Solution (in PYTHON3):

Solution:
from sys import stdin, stdout
import math
from itertools import permutations, combinations
from collections import defaultdict
from collections import Counter
from bisect import bisect_left
import sys
from queue import PriorityQueue

mod = 1000000007

def L():
	return list(map(int, stdin.readline().split()))

def In():
	return map(int, stdin.readline().split())

def I():
	return int(stdin.readline())

def printIn(ob):
	return stdout.write(str(ob)+'\n')

def powerLL(n, p):
	result = 1
	while (p):
		if (p&1):
			result = result * n % mod
		p = int(p / 2)
		n = n * n % mod
	return result

#--------------------------------------

def myCode():
    n, x= map(int, input().split())
    lst1 = L()
    lst2 = list(lst1)
    lst2.reverse()
    # print(lst1)
    # print(lst2)

    for i in range(1,len(lst1)):
        lst1[i] = lst1[i-1]+lst1[i]

    for i in range(1,len(lst2)):
        lst2[i] = lst2[i - 1] + lst2[i]

    # print(lst1)
    # print(lst2)
    flag1 = False
    flag2 = False
    ans1 = -sys.maxsize
    for i in range(len(lst1)):

        if lst1[i]%x is not 0:
            ans1 = max(ans1,i)
            flag1=True
    ans2 = -sys.maxsize
    for i in range(len(lst2)):

        if lst2[i] % x is not 0:
            ans2 = max(ans2, i)
            flag2 = True
    if ans2>ans1 and flag2:
        print(ans2+1)
    elif ans1>=ans2 and flag1:
        print(ans1+1)
    else:
        print(-1)
def main():
    for t in range(I()):
	    myCode()
if __name__ == '__main__':
    # print(math.sqrt(4))
    main()