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: ['Q', '2271', '1803', '2363']

Answer: 6437


Question: ['6565', 'T', 'O', '2901', '5121', 'y', '9617', 't', '7825']

Answer: 32029


Question: ['l', '2149', 'K', 'b', '119', '3179', 'K', 'N', 'w', 'q', 'D']

Answer:
5447