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', 'c', '7971', 'J', 'o']

A: 7971
****
Q: ['7335', '813', '6461', '8903', '3709', 'V', 'G', 'I', 'P', 'p', 's', 'v', 'R', '4697', '4263', '9897']

A: 46078
****
Q: ['X', '9773', 'd', 'l', '3349', 'u', '8997', '787', '1253', '7219', '8533', 'F']

A:
39911
****