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: ['U', '5607', 'Q', 'j', 'I', '3745', '3031']

A: 12383
****
Q: ['j', 'R', '2435']

A: 2435
****
Q: ['2941', 's', '5729', 'y', 'A', '7155', '163', '4925', 'V', 'O', 'E', '2489', 'l', '2699', '8109', '8521']

A:
42731
****