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: ['2787', '6085', '6989']

A: 15861
****
Q: ['f', '6703', 'c', 'c', 'l', '2511', '6507', 'b', '9727', 'l', '1251', 'I', '5231', '91', 'L', 'M', 'd']

A: 32021
****
Q: ['779', 'r', '6853', 'U', 'j', 'W', 'n', 'A', 'g', '4203', '3189', '687', '9719', '1291', 'N', '7995', '6049', 'l']

A:
40765
****