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.

['4749', '1169', '4273', 'X']
10191

['o', 'L', 'E', 'V', 'D', 's', 'Z', 'm', 'a', '2785', 'I', 'v', 'B', '7909', '1599', 'V', 'N']
12293

['C', '5795', 'v', 'Q', 'v', 'e', 'R']

5795