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]: ['3873', 'D', 'J', '2799', 'k', 'F', 'I', '3457', '5647', '4815', '7509', 'Y', '1251', '2211']
[A]: 31562


[Q]: ['z', '9173', 's', '8937', 'h', '1881', '7929', 'b', '2441']
[A]: 30361


[Q]: ['5199', '5539', 'i', '9191', '7053', 's']
[A]:
26982