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.
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Question: ['3877', '2685', 'f', 'r', 'q', 'o', 'k', 'i', '2299', '9075', 'X', '4303', '7379', '9205', 'V', '9655', 's']

Answer: 48478


Question: ['6469', '3027', 'Z', '3353', 'a', 'S', '3879', '8471', 'H', 'I', 'y', '2661', '9007', 'D']

Answer: 36867


Question: ['2287', 'y', '8433']

Answer:
10720