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: ['2765', '6767', '7645']

A: 17177
****
Q: ['4201', '6445', '4009', 'q']

A: 14655
****
Q: ['5515', '7571', 'u', 'p', 'E', '7907', 'J', '7819', '6665', 'r', 'M', 'r', '7601', 't', '5923']

A:
49001
****