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: ['r', '3537', 'T', '3611', 'k', '4983', 'h', '4317', '8727', 'E', '6471', '8465', 'f', '5429', 'T', '2169', '2171', 'P', '6941', 'D']

A: 56821
****
Q: ['3331', '5791', 'r', 'Q', '2243', '8229']

A: 19594
****
Q: ['p', '9715', '5117', '755', 'Q', 'T', 'r', 'R', '3525', '949', 'w', 'J', 'P', '6443', 'm', '5947']

A:
32451
****