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

[EX Q]: ['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']
[EX A]: 14215

[EX Q]: ['s', '7337', '3941', 'L', '9149']
[EX A]:
20427