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]: ['3873', 'D', 'J', '2799', 'k', 'F', 'I', '3457', '5647', '4815', '7509', 'Y', '1251', '2211']
[EX A]: 31562

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

[EX Q]: ['6365', 'Z', '1605', 't', 'w', '4169', 'F', '3233', 'p', '9173', '9505', '4713', 'O', '4355', 'X', 'A', 'g', '4471', '9191']
[EX A]:
56780