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]: ['Q', '9787', '7533', '9489', 'C', '1753', '5121', '1405', '9267', '4815', 's', '5887']
[EX A]: 55057

[EX Q]: ['O', '6337', 'j', '6009', 'z']
[EX A]: 12346

[EX Q]: ['V', '1629', '7157', '1905', '6817', 'O', 'R', '2045']
[EX A]:
19553