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