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: ['h', '2335', '2669', '6035', '9901', '7721', 's', '6181', 'C', 'l', 'x', '8275', '1103', 'S', '6447']

A: 50667
****
Q: ['3839', 'D', '4741', 'L']

A: 8580
****
Q: ['197', '7163', 'G']

A:
7360
****