how to undo only the latest inserted character?

the undo seems to change all text inserted since insert-mode was started.

but what if i want to undo only one character, specifically if i mapped let
say like this:
ino a abc
now after i start again the insert mode and type some text and the 'a'
character which is mapped to 'abc', how do i undo only these three ('abc')
characters?

cheers
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