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]: ['m', 'g', '7251', '5873', '59', '7345']
[A]: 20528


[Q]: ['k', '1489', 'x', '6543', 'I', 'l', 'D', '6299', '1473', 'a', '7661', 'z', 'E', 'Z', 'U', '3671', '2873', 'e', 'p']
[A]: 30009


[Q]: ['E', '7559', 'u']
[A]:
7559