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: ['Y', '9053', 'N', '6921']

A: 15974
****
Q: ['1001', 'T', 'w', 'f', 'Q', '4035', 'b', 'q', 'x', 'R']

A: 5036
****
Q: ['A', '9979', '8723', '1131', 'i', 'p', 'M']

A:
19833
****