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: ['s', '9377', '3663', '1375', 'j', 'L', '7943', '1711', '7409', '9115', '1227', 'I', 'U']

Answer: 41820


Question: ['3557', '3345', '307', '9791', '1897', 'O']

Answer: 18897


Question: ['F', 'o', '263', 'n', '6589', '5579', '8657', 'T', 'P', '17', '3853', '4309', '5747', 'B', 'd']

Answer:
35014