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.

[EX Q]: ['4271', 'N', 'M', '5239', '7037', 'x', 'U', 's', '7107', '4163', 'f', '3607', '6155']
[EX A]: 37579

[EX Q]: ['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']
[EX A]: 14215

[EX Q]: ['T', '957', '1209', 'G', '1569', '9603', 'm', '9359', 'u']
[EX A]:
22697