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.

['M', 'H', 'l', 'Y', '3811', '1953', '5869', 'U']
11633

['8871', '1297', 'W', 'f', 'Y', '8731', '113', '6707', '379', '9631', 'X', 'C', 'q']
35729

['4199', 'K', '8429', '3909', 'f', '8689', '9669', '915', '2889', '1105', 'F', 'C', 'q', '1103', '6635', '9679', '9001', '6197']

72419