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.

['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']
14215

['O', 'j', 'Z', 'u', '7427', '4225', '3139', '9993', '9945', '3639', 'h', 'j', 'f', '6511', 'e', '4607', '2741', '4743']
56970

['7491', 'U', 'o', 'D', '4591', '4343', '5147', '4783', '4725']

31080