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]: ['Q', '9787', '7533', '9489', 'C', '1753', '5121', '1405', '9267', '4815', 's', '5887']
[EX A]: 55057

[EX Q]: ['1869', 'q', '5919', 'D', '7733', '2641', 'h', '1327']
[EX A]: 19489

[EX Q]: ['2791', '8687', 'c', '2847', '8709', 'p', '3385', '2725', 'd', 'W', 'g', '1319']
[EX A]:
30463