Python - Program not displaying as intended
<pre><code>#Hex Check
def Check(HexInput):
    while HexInput!= Valid:
        print('That is an  invalid hex number.')
    else:
        print('That is an valid hex number.')
    return HexInput       

HexInput=input('Enter a hex number: ')
Valid='1234567890ABCDEFG'
</code></pre>

<p>When run, it outputs nothing when a hex number is entered.
The program is aiming to process the users inputted Hex number and output whether it is a valid hex number or not.</p>
