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:
['2787', '6085', '6989']
answer:
15861


question:
['A', '9979', '8723', '1131', 'i', 'p', 'M']
answer:
19833


question:
['6457', '7887', 'U']
answer:

14344