input: def elementwise_matrix_product(A, B):
      """
      Takes two matrices, A and B, and produces a matrix C where each element is the product of the corresponding elements of A and B.
      
      >>> elementwise_matrix_product([[3, 4], [1, 2]], [[7, 5], [0, 1]])
      [[21, 20], [0, 2]]
      """
      C = [[A[i][j] * B[i][j] for j in range(len(A[0]))] for i in range(len(A))]
      return C
output:     C = [[A[i][j] * B[i][j] for j in range(len(A[0]))] for i in range(len(A))]
      return C