Python: how to rewrite a list in a different style? : I am generating most common items from a list using this code:

    content_count = [item for item in content_S if item[:1].isupper()]
    content_E = Counter(content_count)
    E = content_E.most_common(3)

the code generate a list like this:

    E = [('item1', 8), ('item2', 6), ('item3', 5)]

Is there a way to convert the list E into something like this:

    S = ['item1', 'item2', 'item3']

Searched for an answer here but no luck.
Thanks in advance