In this task, you will be presented with a question in Dutch language, and you have to write the person names from the question if present. B denotes the first item of a phrase and an I any non-initial word. Phrase used for the person name - PER. There can be instances with no person name entity, then return 'None'.

Ex Input:
Deze winter

Ex Output:
None


Ex Input:
Topsnelheid ( km / u ) : 185

Ex Output:
None


Ex Input:
Ter wille van de veiligheid van de voorbijgangers en de veiligheid van de jongelui zelf , is het voortaan verboden te skaten in Brussel .

Ex Output:

None