Given a n*m matrix A and a p*q matrix B, their Kronecker product C = A tensor B, also called their matrix direct product, is an (np)*(mq) matrix.
A tensor B
=
|a₁₁B    a₁₂B|            
|a₂₁B    a₂₂B|
=   
|a₁₁b₁₁    a₁₁b₁₂    a₁₂b₁₁    a₁₂b₁₂|
|a₁₁b₂₁    a₁₁b₂₂    a₁₂b₂₁    a₁₂b₂₂|
|a₁₁b₃₁    a₁₁b₃₂    a₁₂b₃₁    a₁₂b₃₂|
|a₂₁b₁₁    a₂₁b₁₂    a₂₂b₁₁    a₂₂b₁₂|
|a₂₁b₂₁    a₂₁b₂₂    a₂₂b₂₁    a₂₂b₂₂|
|a₂₁b₃₁    a₂₁b₃₂    a₂₂b₃₁    a₂₂b₃₂|

Example 1:

Input: 
n = 2, m = 2 
p = 2, q = 2
A = {{1, 2}, 
     {3, 4}}
B = {{0, 5}, 
     {6, 7}}
Output: {{0, 5, 0, 10}, 
         {6, 7, 12, 14}, 
         {0, 15, 0, 20}, 
         {18, 21, 24, 28}}
Explaination: If the multiplication process 
is followed then this will be the answer.

Your Task:
You do not need to read input or print anything. Your task is to complete the function kroneckerProduct() which takes n, m, p, q and A and B as input parameters and returns the resultant matrix.

Expected Time Complexity: O(n*m*p*q)
Expected Auxiliary Space: O(n*m*p*q)

Constraints:
1 ≤ n, m, p, q ≤ 20
1 ≤ A[i][j], B[i][j] ≤ 100