In python - create a stack class that uses a list to store the stack's data. it needs to include these methods:

push(integer)

pop()

- which returns the element at the top of the stack

checksize()

- which returns the count of elements in the stack

For the following example of making a peanut butter and jelly sandwich, identify which are inputs, processes, or outputs: bread scooping and spreading peanut butter plate scooping and spreading jelly finished sandwich putting two pieces of covered bread together dirty plate crumbs