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]: ['5499', '39', 'Q', 'b', 'W', '7155', '2515']
[EX A]: 15208

[EX Q]: ['k', '1489', 'x', '6543', 'I', 'l', 'D', '6299', '1473', 'a', '7661', 'z', 'E', 'Z', 'U', '3671', '2873', 'e', 'p']
[EX A]: 30009

[EX Q]: ['5347', 'E', 'a', '5379', '405', '1171', 'v', 'J']
[EX A]:
12302