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: ['z', 'E', 'u', '4437', '7767']

A: 12204
****
Q: ['D', 'G', '9895', '143', '37', 'S', '1539', 'x', 'a', 'x', 'B', 'i', '9719', '839']

A: 22172
****
Q: ['2563', 'P', '3489', '6209', 'b', 'Z', 'p', 'V', '1715', '3527', '3455', 'C', 'r', '7741', 'j']

A:
28699
****