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]: ['U', '5885', 'u', 'Y', 's', 'w', 'j', '9629', '9505', 'U']
[EX A]: 25019

[EX Q]: ['8755', 'A', '2893', '6703']
[EX A]: 18351

[EX Q]: ['y', '6613', 'g', 'z', '9693', 'o']
[EX A]:
16306