beginners-task-4
Source: hackerearth
Difficulty: UNKNOWN_DIFFICULTY

Naruto is a fan of numbers, he likes to play with them. This time he decided to multiply numbers and produce output. After every k elements he decides to find x^m, where x is the multiplication till k elements and m is a random number that naruto takes. Help naruto find the output. 

As answer could be large, help him, calculate value modulo w.

Input
T=number of test case
N=number of elements he will enter
K=every kth element
M=Random number
W=Modulo 
A[i]=n elements to be entered.  

Output
Output answer of each test case in one line.  

Constraint:
0<t<100
0<a[i]<10000000
1<n<101
k<100000
m<100000 
w<100000    

SAMPLE INPUT
2
5 2 2 5
1 2 3 4 5
5 2 2 5
1 2 3 4 6

SAMPLE OUTPUT
0
4

Explanation

In first case n=5,k=2,m=2,w=5;
Step 1
1
Step 2: 12=2
since k=2 therefore 2^m=2^2=4;
Step 3: 43=12
Step 4: 124=48
since k=2,therefore 48^m=48^2
step 5: 23045=11520
step 6: 11520%5=0

2nd Test case
Step 1
1
Step 2: 12=2
since k=2 therefore 2^m=2^2=4;
Step 3: 43=12
Step 4: 124=48
since k=2,therefore 48^m=48^2
step 5: 23046=13824
step 6: 13824%5=4


def power1(x,n,MOD):
	if(n==0):
		return 1
	ret=1
	while(n):
	if(n&1):
		ret*=x
		ret%=MOD
	x*=x
	x%=MOD
	n>>=1
	return ret
T=eval(input())
while(T):
	T-=1
	N,K,M,W=list(map(int,input().split()))
	L=list(map(int,input().split()))
	prod=1
	for x in range(N):
		prod=prod*L[x]%W
		if((x+1)%K==0):
			prod=power1(prod,M,W)
			prod%=W
		if(prod==0):
			break
	print(prod%W)