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.

['O', '6337', 'j', '6009', 'z']
12346

['g', 'A', 'r', '539', '5459', '2725', '7447', '3693', '1757', 'r', 'W', '5949', '4569', '5153', '3985', 'Q', '505', 'M', '8989']
50770

['3443', '3183', '9755', '3497', 'o', 'I', 'V', '2017', '3051', '6683']

31629