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.

['4271', 'N', 'M', '5239', '7037', 'x', 'U', 's', '7107', '4163', 'f', '3607', '6155']
37579

['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']
26755

['1359', '5861', '8349', '7449', 'x', 'N', 'y', '11', '7475', '9641', 'g', '3377', 'r', '9563', '4231', '5097', '6053']

68466