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]: ['j', '6731', 'h', 'G', 'F', '6899', '4317', 'm', '9491', 'l', '971']
[EX A]: 28409

[EX Q]: ['X', 'Q', 'I', '415', '6827', 'T', '1089', '7279', '2085', '5625', 'p', 'j', 'a', '7295', 'E', 'x', 'l', 'M']
[EX A]:
30615