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:
['Q', '2271', '1803', '2363']
answer:
6437


question:
['2013', 'S', 's', '9353', 'b', 'u', '6687', '5429', '3545', '7269']
answer:
34296


question:
['t', 'C', '5289', '1183', 'z', 'm', 'N', '5357', '7197', '5635', '7817', '6951', '6613', 'q', 'e', '1649', '2169', 'P', 'a']
answer:

49860