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', '8841', 'H', 'v', '2435', '8221', '807', 'P', '2247', 'M', '4609', '5657', 'k', '2807', 'j', '8451']
44075

['S', 'D', '3101', '4967', '8197', '5025', '4257', 'S', 'X', '7641', 'n', '6775', '4719', 'o', '2821', 'x', '5605', '2181']
55289

['O', 'j', '5865', '4973', 'J', 'Y', 'y', '8067', 'R', '1125', '5959']

25989