Для четных:
=SUMPRODUCT(--ISEVEN(--MID(SUBSTITUTE(A1,",",REPT(" ",99)),(ROW($XFD$1:INDEX($XFD:$XFD,LEN(A1)-LEN(SUBSTITUTE(A1,",",""))+1))-1)*99+1,99)))
Нечетных:
=SUMPRODUCT(--ISODD(--MID(SUBSTITUTE(A1,",",REPT(" ",99)),(ROW($XFD$1:INDEX($XFD:$XFD,LEN(A1)-LEN(SUBSTITUTE(A1,",",""))+1))-1)*99+1,99)))
![enter image description here](https://i.stack.imgur.com/HqEJH.png)