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: ['4515', '3911', 'M', 'T', 'w', 'F']

A: 8426
****
Q: ['R', 'k', '3355', 'Y', '6635', 'M', '4839', 'T', 'd', '495', 'g', 'E', 'g', 'F', 'S', '5377', 'g']

A: 20701
****
Q: ['1703', 'l', 'w', '7305', 'K', '9203', '4111', 'l', 'H']

A:
22322
****