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'.

Input: Consider Input: Vanaf 21 uur gaf de VTM Big Band een concert tot omstreeks middernacht .

Output: None


Input: Consider Input: Zo konden ze beter in het oog worden gehouden .

Output: None


Input: Consider Input: " Dat weet ik niet .


Output: None