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]: ['4997', '5005', '6773', 'q', 'K', '8391', '7303', 'K', 'N', '5417', '8573', 'z', '8653', '8343', 'm', 'L', '1587', 'p', '5323']
[EX A]: 70365

[EX Q]: ['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']
[EX A]: 17925

[EX Q]: ['D', 'Q', '4025']
[EX A]:
4025