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]: ['s', 'g', 'Z', '8919', 'R']
[EX A]: 8919

[EX Q]: ['s', '9377', '3663', '1375', 'j', 'L', '7943', '1711', '7409', '9115', '1227', 'I', 'U']
[EX A]: 41820

[EX Q]: ['7885', 'f', 'V', '5889']
[EX A]:
13774