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]: ['z', '3199', 'r', '849', 'C', 'v', '1931', 'M', 'Q', '4531', '579', 'x', '8997', '4663']
[EX A]: 24749

[EX Q]: ['3895', 's', 'j', '7755', 'H', '7941', '4903', 's', '3629', '1183', '1001', '5569', 'q', '4735']
[EX A]: 40611

[EX Q]: ['8801', '4271', 'l', '2873', '5703', 'v', '3379', 'T', '3909', 'U', 'C', '3445', 'R', 'x', 'G', '2251', 'c', '6221', '7477']
[EX A]:
48330