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: ['D', 'P', 'y', '4891', '1539', 'J', '5737']

A: 12167
****
Q: ['55', 'u', 'r', '197', 'G', '8327']

A:
8579
****