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.

[Q]: ['J', 'm', '1255', 'S']
[A]: 1255


[Q]: ['433', 'y', '2015', '5997', 'X', 'u', '9321', '8037', 'N', 'Z', 'E', '4645', '627', '6595', '7679']
[A]: 45349


[Q]: ['C', 'p', 'D', '7881', '9525', '2493', 'x', '9969', 'g', 'x', '2941', 'j', '9261', '7063', 't', 'B']
[A]:
49133