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: ['3497', '761', '6157', 'J', 'n', '139', '9895', '2939', 'K', 'I', '2161', 'c', 'a', '485', '7959', 'i', '4753', '3305', 'G', '3475']

A: 45526
****
Q: ['6867', 'x', '8481', '5091', '979', 'a', 'S', 'i', 'd', '1591']

A: 23009
****
Q: ['l', 't', 'v', '5923', '6443', 'P', 'u', '3357', 'I', 'm', 'p', 'o', '267', '3979']

A:
19969
****