Finger movement for basic magic series

In any of the MvC games, whenever I launched the opponent I can’t get the rhythm to do a basic magic series. Am I suppose to use my first finger for the lp and lk, middle finger for mp and mk, then lastly my ring finger to finish it?

if im playing MvC1 and earlier:

forefinger lp, thumb lk, middle finger mp, thumb mk, ring finger hp, thumb hk (if necessary)

for MvC2:

forefinger lp, thumb lk, forefinger lp again (mp) thumb lk again (mk) middle finger hp, thumb hk (if necessary)

I second what NickGuy said. Using your thumb really helps.