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]: ['d', '5571', '6455', '4287', 'I', 'U', 'M', '8303', '8893']
[EX A]: 33509

[EX Q]: ['t', 'Q', '5189', 'g', 'c', '4685', '5309', 'W', '6729', '2843']
[EX A]: 24755

[EX Q]: ['5975', 'V', '4459', 'a', 'P']
[EX A]:
10434