[Basic] Swap kth elements

Given an array, swap kth element from beginning with kth element from end.

Input:

The first line of input contains an integer T denoting the number of test cases.
The first line of each test case is N and k,N is the size of array and kth number.
The second line of each test case contains N input C[i].

Output:

Print the modified array.

Constraints:

1 ≤ T ≤ 100
1 ≤ K ≤ N ≤ 500
1 ≤ C[i] ≤ 1000

Example:

Input
1
8 3
1 2 3 4 5 6 7 8

Output
1 2 6 4 5 3 7 8

def swap_kth(a, arr):
    temp = list()
    temp.append(arr[a-1])
    arr[a-1] = arr[-a]
    arr[-a] = temp[0]
    return ' '.join(map(str, arr))


t = int(input())
for i in range(t):
    N = list(map(int, input().split()))
    a = N[1]
    arr = list(map(int, input().split()))
    print(swap_kth(a,arr))