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

['f', 'N', '8597', 't', 'K', '9755', 'j', '9747', '7259', '5493', 'n', '7269', '8493', '2279', '5369', 'f']
64261

['8711', '7477', '6329', 'R', 'J', '7743', 'r', '5025', 'P', '6431', 'R', 'F', '1769', '937', '2269', 'N', '1205']

47896