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

[EX Q]: ['n', 'u', '9595', 'M', 'o', 'K', '5073', 'x']
[EX A]: 14668

[EX Q]: ['W', 'w', '8559', '1025', '8267', '8337', '5887', '839', 'z', 'O']
[EX A]:
32914