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]: ['7411', 'Y', 'x', 'l', '4119', '7241']
[EX A]: 18771

[EX Q]: ['6255', '8457', 'V', 'z', '4405', 'X', '9267', '5329', 'I']
[EX A]: 33713

[EX Q]: ['Q', '4341', 'k', 'l', '855', '4615', 'd', '527', 'E', 'P', 'b', '2589']
[EX A]:
12927