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]: ['4749', '1169', '4273', 'X']
[A]: 10191


[Q]: ['h', '6937', 'U', 'f', 'S', 'm', '9699', 'E', '4559', 'p', 'Z', 'o', '6409', 's', '4537', '5135', '6901', '6489', '5833', 'l']
[A]: 56499


[Q]: ['B', 'U', 'v', '7823', '8953', '4513', 's', 'H', 'e', '2805', 'Y', 's', '3917', '8893', 'i', 'u', '7131', 'x', 'k', '9367']
[A]:
53402