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]: ['8743', 'Y', 'O', '8265', '1029', '5689', 'F', 'j', 'Z', 'i', 'S', '1285', '737']
[EX A]: 25748

[EX Q]: ['r', 'B', '8791', '3165', 'n', 'm']
[EX A]: 11956

[EX Q]: ['4653', '1705', '7339', 'L', 'N', '3029', '8429', '3843', '999']
[EX A]:
29997