Print only vowels in a string
<p>I am new in Python and I'm trying to print all the vowels in a string. So if someone enters "Hey there, everything alright?" , all vowels needs to be printed...but I don't know how? (so it's not about counting the vowels, its about printing the vowels)</p>

<p>For now I've got this ;</p>

<pre><code>sentence = input('Enter your sentence: ' )

if 'a,e,i,o,u' in sentence:
    print(???)

else:
    print("empty")
</code></pre>

<p>Something like this?</p>

<pre><code>sentence = input('Enter your sentence: ' )
for letter in sentence:
    if letter in 'aeiou':
        print(letter)
</code></pre>

python string python-3.x printing