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]: ['T', '8333', 'C', 'Z', 'n', '1419', 'd', '3205', 'D', '1187', 'd']
[EX A]: 14144

[EX Q]: ['r', '6537', '3001', '7879']
[EX A]: 17417

[EX Q]: ['4175', '2737', '5589', '6655']
[EX A]:
19156