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]: ['6907', '9123', 'L', '8871', 'q', 'C', 'U', '7403', 'F', '3827', '3951', '8879', '2865', 'x', '6175', 'T', '1147']
[A]: 59148


[Q]: ['r', '6537', '3001', '7879']
[A]: 17417


[Q]: ['1919', 'B', 'C', 'Z', '1879', '8187', '1757', 'u', '6837', '1341', '981', 'Q', '3399']
[A]:
26300