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]: ['2923', '3573', '6179', '7673', '6551', 'B', '315', '5169', 'm', '9405', 'm', 'Z']
[EX A]: 41788

[EX Q]: ['5347', 'E', 'a', '5379', '405', '1171', 'v', 'J']
[EX A]: 12302

[EX Q]: ['R', 'I', 'f', 'K', 'p', '8579', 'e', '1223', 'I', 'K', '8311', '2147', '4241', 'z', '6671', 'r']
[EX A]:
31172