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]: ['Q', '8841', 'H', 'v', '2435', '8221', '807', 'P', '2247', 'M', '4609', '5657', 'k', '2807', 'j', '8451']
[A]: 44075


[Q]: ['6629', 'o', 'e', '497', '4865', '8733', '5733', '7337', 'N']
[A]: 33794


[Q]: ['O', 't', '2153', '895', 'G', '6665', '5663', '1453', 'r', 'V', 'Q']
[A]:
16829