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]: ['R', 'k', '3355', 'Y', '6635', 'M', '4839', 'T', 'd', '495', 'g', 'E', 'g', 'F', 'S', '5377', 'g']
[EX A]: 20701

[EX Q]: ['3121', 'j']
[EX A]: 3121

[EX Q]: ['5415', 'u', '4377', '2147', '3927', '7989', '6677', 'n', '8035', 'z', 'f', '5347', '3361', 'l', 'C', 'A', 'r', '4265', '9053', '5371']
[EX A]:
65964