Problem 44491. Shuffle

Shuffle a vector by breaking it up to segments of n elements, and rearranging them in a reversed order.

For example, the vector:

 vector = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

should be shffuled by segments of n=3 like so:

 cetvor = [8,9,10,   5,6,7,   2,3,4,   1]

The shuffled vector should have the same dimensions as the original one.

You must call the functions push() and pop().