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]: ['191', 'R', 'Q', '7809', '4851', 'b', 'e', 'H', 'E', 'I', 'r', 'A', 'g', 'e', 'g', 'I', 'j', 'f', '7287']
[A]: 20138


[Q]: ['T', '721', '6555', 'g', 'y', 'U', '3053', 'A', '9663']
[A]: 19992


[Q]: ['I', 'N', '2555', 'V', 'D', '761', 'u', 'J', 'E', '5357', 'Y', 'M']
[A]:
8673