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]: ['3071', '355', 'e', '9781', 'R', '6833', 's', '2665', 'L', '9551', 'P', '6101', '2955', '4643', 'O', '3327', '2163', '685', '4277', 'B']
[EX A]: 56407

[EX Q]: ['p', '6399', 'j', 'u', 'c', 'Y', '8555', 'X', '5535', '789', '3491', '5427', 'e', 'Z', '6603', '2569', 'Z', 'A']
[EX A]:
39368