Python: how do I split() each symbol until reach separator symbol

I have a string:

a = "12356789:10:51:52:53"

As a result, I need a list like:

['1','2','3','5','6','7','8','9','10','51','52','53']

How can I split one by one symbols until I find : separator?

You can try this:

list((x:="12356789:10:51:52:53".split(":"))[0]) + x[1:]

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