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: ['w', '1335', 'G', 'h', '6729', '1999', 'u', 'I', 'r', 'm', '4757', 'W', '3715', '701', '1999']

A: 21235
****
Q: ['3121', 'j']

A: 3121
****
Q: ['K', '6017', '4041', '6621', '7553', '6357', '5563', 'f', 'L', '9451', '1263', '5055']

A:
51921
****