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.

[Q]: ['c', '4501', 'O']
[A]: 4501


[Q]: ['2585', '3043', 'w', '7697', '53', 't', 'A']
[A]: 13378


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