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: ['D', 'm', 'P', '2433', '6731']

A: 9164
****
Q: ['z', 'E', 'u', '4437', '7767']

A: 12204
****
Q: ['H', '5743', 'S', '4137', '5881', 'M', 'x']

A:
15761
****