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]: ['N', 'V', 't', 'X', 't', 'M']
[A]: 0


[Q]: ['R', 'I', 'f', 'K', 'p', '8579', 'e', '1223', 'I', 'K', '8311', '2147', '4241', 'z', '6671', 'r']
[A]: 31172


[Q]: ['E', 'H']
[A]:
0