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]: ['6217', 'A', '1925', 'o', '1433']
[EX A]: 9575

[EX Q]: ['f', 'N', '8597', 't', 'K', '9755', 'j', '9747', '7259', '5493', 'n', '7269', '8493', '2279', '5369', 'f']
[EX A]: 64261

[EX Q]: ['t', 'S', '875', '2297', '5705', 'V', '2801', '8179', '539', 'X', 'v']
[EX A]:
20396