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.

['2775', '7405', 'F', 'D', '9025', '827', 'e', 'j', 's', 'e', 'Q', '1137', 'G']
21169

['4701', 'b', 'i', 'B', 'z', '7837', 'W']
12538

['6755', 'f', '3045', '6687', 'U', '8771', '3545', '1943']

30746