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]: ['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']
[EX A]: 14215

[EX Q]: ['6849', 'I', 'p', 's', 'L', '4757', 'j', 'x', 'm', 'P', '5237', '1105', '9015', '9279', 'Q']
[EX A]: 36242

[EX Q]: ['l', '7577', 'z']
[EX A]:
7577