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]: ['x', '5259', 'T', 'L', 'C', 'H', '2493', 'u', '3851', '2439', 'U']
[A]: 14042


[Q]: ['6217', 'A', '1925', 'o', '1433']
[A]: 9575


[Q]: ['3321', '4931', '6427', '9135']
[A]:
23814