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]: ['1001', 'T', 'w', 'f', 'Q', '4035', 'b', 'q', 'x', 'R']
[EX A]: 5036

[EX Q]: ['3121', 'j']
[EX A]: 3121

[EX Q]: ['6429', '807', 'm', '4313', 'P', '7961', 'W']
[EX A]:
19510