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]: ['D', 'K', 'n', 'd', 'i', 'U']
[A]: 0


[Q]: ['s', '407', '7983', '1523', '8983', '9841', 'p', 'y', 'N', '7633', 'T', '4177', 'Z', 'Y', '3223', '7125', '2601', '7467', '3039']
[A]: 64002


[Q]: ['8855', '8907', '5873', 'K', '9989']
[A]:
33624