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:
['z', 'j', 'M', 'E', '1689', '8413', '2603', 'b', '5101', 'w', 'r']
answer:
17806


question:
['c', 'd']
answer:
0


question:
['1371', 'u', 'Y', 'W', '1409', 'M', '5621', '1427', '6147', '7131', '6521', '2423', 's', '7617', 'l', 'f', '8851', '2665', 'G', '6831']
answer:

58014