How can I seperate numbers followed by a comma from a string

Can someone please help me how to extract numbers from a string to seperate colums that is seperated by a comma
103,19810321,20,12,1,1,19,394,2,-
119,198,38,4,62,37,9,36,1274589,-
125,1,10,31,18458,8,35,394,32,-
etc the problem I can't use mid-function because the numbers could be 1 digit or even upto 8 or 9 digits. Please help!!!