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', 'O', 'H', '7619', '6435', 'X', 'g', '1663']
15717

['6165', 'x', 'u', 'n', 'V', 'B', '4039', 'l', '991', 'x', '335', '9011', 'K', '8725', 'a', '6291', 'j']
35557

['2757', 'f', 'q', 'v', 'V', 'P', '8071', 'N', '8563', 's', '955', 'u', 'A', '4723', 'C', '1479', 'V']

26548