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]: ['2417', '6671']
[EX A]: 9088

[EX Q]: ['S', 'W', '2171', '6405', 'h', 'C', '1597', '7109', 'Q', 'p', '2747', 't', 'J', 'q', '1883', 'v', 'O']
[EX A]: 21912

[EX Q]: ['d', 'g', 'V', '7573', 'n', '4111', 'V', '5943', '6821']
[EX A]:
24448