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]: ['7771', 'g']
[EX A]: 7771

[EX Q]: ['R', 'k', '3355', 'Y', '6635', 'M', '4839', 'T', 'd', '495', 'g', 'E', 'g', 'F', 'S', '5377', 'g']
[EX A]: 20701

[EX Q]: ['h', 'W', 'v', 'P', 's', 'g', '4147', 'c', 'K', 'U', '8021', 'm', '4103', 'p', 's', '2595']
[EX A]:
18866