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]: ['m', 'g', '7251', '5873', '59', '7345']
[EX A]: 20528

[EX Q]: ['Z', '4157', '5185', 'U', 'i', '1115', 'A', '7427', '3313', 'S']
[EX A]: 21197

[EX Q]: ['2663', '1265', 'e', 'g', '2957', '7897', 'r']
[EX A]:
14782