[Python] Can't wrap my head around how to remove a list of characters from another list

I've been able to isolate the list (or string) of characters I want excluded from a user entered string. But I don't see how to then remove all these unwanted characters. After I do this, I think I can try joining the user string so it all becomes one alphabet input like the instructions say.

Instructions:

Remove all non-alpha characters Write a program that removes all non-alpha characters from the given input.

For example, if the input is:
-Hello, 1 world$!
the output should be:
Helloworld

My code:

userEntered = input()
makeList = userEntered.split()
def split(userEntered):
return list(userEntered)


if userEntered.isalnum() == False:
for i in userEntered:
if i.isalpha() == False:
#answer = userEntered[slice(userEntered.index(i))]
reference = split(userEntered)
excludeThis = i
print(excludeThis)




When I print excludeThis, I get this as my output:

-
,

1

$
!


So I think I might be on the right track. I need to figure it out how to get these characters out of the user input. Any help is appreciated.

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