In this task, you are given an input list A. You need to find all the elements of the list that are numbers and calculate their sum.
--------
Question: ['7973', 'J', '9035', 'H', '4051', '2661', 's', 'z', '8225', 'M', '4153']

Answer: 36098


Question: ['h', 'a', '1645', '2391', '759', '519', '3331', '2831', '3427', '9893', 'u', 'J', '7391', '8379', 'V']

Answer: 40566


Question: ['k', 'a']

Answer:
0