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: ['g', 'A', 'r', '539', '5459', '2725', '7447', '3693', '1757', 'r', 'W', '5949', '4569', '5153', '3985', 'Q', '505', 'M', '8989']

A: 50770
****
Q: ['I', 'n', '3069', '477', 'F', 'k', '847', '6777', 'N', 'X', 'F', '1417', '9445', 'o', 'v', 'd', '2169', 'w']

A: 24201
****
Q: ['Q', 'g', '4675', 'I', '4797', '8411', '8219', '5805', 'y', '9665', 'M', '6439', '6061', 'u', '839', 'Y', '6439', '7667', 'S', 'V']

A:
69017
****