Return the index of the axis of A with the smallest absolute stride:

• that is the axis a loop should iterate innermost for cache-friendly access
• return -1 if the array has any zero-stride axis

Input

[[[0. 0. 0. 0.]
  [0. 0. 0. 0.]
  [0. 0. 0. 0.]]

 [[0. 0. 0. 0.]
  [0. 0. 0. 0.]
  [0. 0. 0. 0.]]]

Output

2