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]: ['P', '6299', '9655', 'l', '6317', '2139', '3347', 'l', '3095', '7363', '3115', '7529', 'R']
[EX A]: 48859

[EX Q]: ['M', '6989', 'I', 'w', '3591', '3067', '3883', 'C', '6049', '5723', 'j', '5989', 'C', 'R', '475', '7779', '671']
[EX A]: 44216

[EX Q]: ['u', '8357', 'L', '4999', '171', 'O', '9169', '7509']
[EX A]:
30205