instruction:
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.
question:
['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']
answer:
26755

question:
['9401', 'w', 'b', '8287', 'n', 'O', 'H', 'h', '45', '2337']
answer:
20070

question:
['7889', 'S', 'X', '6593', '5693', 'j']
answer:
20175