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.

[EX Q]: ['7763', '6003', 'V']
[EX A]: 13766

[EX Q]: ['k', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']
[EX A]: 30645

[EX Q]: ['W', '9905', '7473', '7795', 'A', '5521', '5907', '2589', 'q', 'W', '9749', 'q', '4235', '4177', 'F', 'c', 's', '2457', 'N', 'u']
[EX A]:
59808