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]: ['Y', 'X', 'd', 'N', '1877', '2865', 'M', '1249', '9385', 'v', 'o', 'P', 'P', '6029']
[A]: 21405


[Q]: ['3809', '9401', '63', '5705', 'u', '6275', 'k', 'l', '1171', '9365', 'L', 'O', '7431', '8567', 'h', '6135']
[A]: 57922


[Q]: ['7271', 'U', 'V', 'U', 'b', 'n', '7681', 'V', 'v', '2683', 'G', 'N', '8635', '5079', 'j', '4179']
[A]:
35528