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: ['8755', 'A', '2893', '6703']

Answer: 18351


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

Answer: 41820


Question: ['6181', '7075', 'Z', '6993', '8141', '4691', '5481', 'u', '2335', 'l', '485', 'F', '2173', 'H']

Answer:
43555